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live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collect words for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he would work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \ere are we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once she has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of worer ld geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the South China Sea. PART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you evseen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look atus.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn’t need to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who told us that half of the people in her country couldn’t read or write. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before. 在欧盟、北美等发达国家，在政府立法推动下，太阳能发电应用呈现出蓬勃发展的趋势，屋顶发电和并网发电已非常普遍。
综上所述，世界各种权威机构对可再生能源替代速度和光伏发电未来前景的预测具有高度一致性。我们有理由相信这些预测结果具有很高的科学性和可信度，因而具有重要的参考价值。这些预测充分说明可再生能源替代化石燃料的紧迫性和必然性，说明光伏发电未来的重要战略地位。
3.1.2 国内光伏发电系统应用情况介绍 （1）中国电力现状和未来电力缺口分析
中国的电力供应在2000年以前并不紧张。2001年以后，由于经济发展迅猛，电力需求以每年超过20%的速度增长，2003年全国出现电力供应严重不足的现象，电力供应的紧张情况在相当长的时期内都不会缓解。2002年全国电力装机容量35657万千瓦，其中：煤电占74.5%，发电量16542亿千瓦时，煤电占81.7%。表6给出了2008年我国电力装机和发电情况。
按照目前的经济发展趋势和中国的资源情况，2010年和2020年的电力供应单靠传统的煤、水、核是不够的，尚存在一定的缺口，需要由可再生能源发电来填补。
表5 2008年中国电力装机和发电情况（电力科学院） 发电方装机容量（10MW） 发电量（亿千瓦时） live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collectwords for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he ould work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \e we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once sh China Sea. e has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of world geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the SouthPART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you ever seen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look at us.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn nee to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who old us that half of the people in her country couldn’t read orwrite. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before.
live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collect words for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he would work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \ere are we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once she has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of worer ld geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the South China Sea. PART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you evseen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look atus.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn’t need to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who told us that half of the people in her country couldn’t read or write. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before. 式 容 量 占总量百分电 量 比 （亿千瓦（10MW） （%） 时） 74.5 24.1 1.25 100 13522 2746 265 16542 占总量百分比 （%） 81.7 16.6 1.6 100 火电 水电 核电 总计 26554 8607 446 35657 光伏发电系统将在中国未来的电力供应中扮演重要的角色，预计到2010年中国的光伏发电累计装机容量将达到600MWp，2020年累计装机将达到30GWp，2050年将达到100GWp。根据电力科学院的预测，到2050年中国可再生能源发电将占到全国总电力装机的25%，其中光伏发电占5%以上。 表6 2010和2020年中国发电装机预测（GW）（电力科学院）
年 2010 68.40% 592 2020 62.30% 23.20%
图1 中国2010年常规发电装机和缺口预测
live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collectwords for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he ould work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \e we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once sh China Sea. e has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of world geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the SouthPART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you ever seen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look at us.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn nee to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who old us that half of the people in her country couldn’t read orwrite. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before.
煤 400 水 135 23.10% 220 核 12.5 2.10% 36 3.80% 缺口 37 6.40% 102 10.70% 总计 584.5 100% 950 100%
live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collect words for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he would work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \ere are we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once she has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of worer ld geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the South China Sea. PART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you evseen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look atus.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn’t need to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who told us that half of the people in her country couldn’t read or write. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before.
图2 中国2020年常规发电装机和缺口预测
（2）中国太阳能的资源状况
我国地处北半球，土地辽阔，幅员广大，国土总面积达960万平方公里。南从北纬4的曾母暗沙，北到北纬52.5的漠河，西自东经73的帕米耳高原，东至东经135的黑龙江与乌苏里江汇流处，距离都在5000公里以上。在我国广阔富饶的土地上，有着丰富的太阳能资源。全国各地的年太阳辐射总量为928－
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o
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live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collectwords for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he ould work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \e we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once sh China Sea. e has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of world geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the SouthPART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you ever seen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look at us.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn nee to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who old us that half of the people in her country couldn’t read orwrite. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before.
live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collect words for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he would work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \ere are we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once she has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of worer ld geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the South China Sea. PART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you evseen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look atus.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn’t need to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who told us that half of the people in her country couldn’t read or write. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before. 2333KWh/m，中值为1626kWh/m。
根据各地接受太阳总辐射量的多少，可将全国划分为五类地区。
一类地区为我国太阳能资源最丰富的地区，年太阳辐射总量6680-8400 MJ/m，相当于日辐射量5.1-6.4KWh/m。这些地区包括宁夏北部、甘肃北部、新疆东部、青海西部和西藏西部等地。尤以西藏西部最为丰富，最高达2333KWh/m（日辐射量6.4KWh/m），居世界第二位，仅次于撒哈拉大沙漠。
二类地区为我国太阳能资源较丰富地区，年太阳辐射总量为5850-6680 MJ/m，相当于日辐射量4.5-5.1KWh/m。这些地区包括河北西北部、山西北部、内蒙古南部、宁夏南部、甘肃中部、青海东部、西藏东南部和新疆南部等地。
三类地区为我国太阳能资源中等类型地区，年太阳辐射总量为5000-5850MJ/m，相当于日辐射量3.8-4.5KWh/m。主要包括湖南、湖北、山东、河南、河北东南部、山西南部、新疆北部、吉林、辽宁、云南、陕西北部、甘肃东南部、广东南部、福建南部、苏北、皖北、台湾西南部等地。
四类地区是我国太阳能资源较差地区，年太阳辐射总量4200-5000MJ/m，相当于日辐射量3.2-3.8KWh/m。这些地区包括广西、江西、浙江、福建北部、广东北部、陕南、苏北、皖南以及黑龙江、台湾东北部等地。
live in the mountains of the eastern USA speak with an older kind of English dialect. When Americans moved from one place to another, they took their dialects with them. So people from the mountains in the southeastern USA speak with almost the same dialects as people in the northwestern USA. The USA is a large country in which many different dialects are spoken. Although many Americans move a lot, they still recognize and understand each other’s dialects. THE OXFORD ENGLISH DICTIONARY You may think that English dictionaries have been used for many, many centuries. The spelling of English has always been a problem but it was more of a problem in the days before a dictionary. Then people could spell word in different ways which you might find it interesting. But it made reading English much more difficult. So dictionaries were invented to encourage everybody tospell the same. In fact, an English dictionary like the kind you use today wasn’t made until the time of the late Qing Dynasty. There men did most of the important early work on dictionaries: Samuel Johnson, Noah Webster, and James Murray. These men spent nearly all of their lives trying to collectwords for their dictionaries. For them, it wasn’t only a job; it was a wonderful journey of discovery. The largest dictionary in the world is the Oxford English Dictionary, or OED for short. The idea for this dictionary came from an important meeting in Britain in 1857. Twenty-two years later, Oxford University asked James Murray to be the editor of its new dictionary.Murray had never been to college. At the age of fourteen, he left his village school in Scotland and taught himself while working in a bank. Later he became a great teacher. After Oxford gave him the job, Murray hada place built in the garden behind his house to do his work. Part of it was one meter underground. In winter it felt like a barn, he had to wear a heavy coat and put his feet in a box to keep warm. Every morning, Murray got out of bed at five o’clock and worked several hours before breakfast. Often he ould work by the candle light into the evening. Murray hoped to finish the new dictionary in ten years. But after five years, he was still adding words for the letter A! then others went to work with Murray, including his two daughters. He worked on the dictionary until he was very old. Forty-four years later, in1928, other editors finished it. It included more than 15,000 pages in twelve books. And you thought your dictionary was big! Unit 3 JOURNEY DOWN THE MEKONGPART 1 THE DREAM AND THE PLAN My name is Wang Kun. Ever since middle school, my sister Wang Wei and Ihave dreamed about taking a great bike trip. Two years ago she bought an expensive mountain bike and then she persuaded me to buy one. Last year, she visited our cousins, Dao Wei and Yu Hang at their college in Kunming. They are Dai and grew up in western Yunnan Province near the Lancang River, the Chinese part of the river that is called the Mekong River in other countries. Wang Wei soon got them interested in cycling too. After graduating from college.we finally got the chance to take a bike trip. I asked my sister, \e we going?\ who first had the idea to cycle along the entire Mekong River from where it begins to where it ends. Now she is planning our schedule for the trip.I am fond of my sister but she has one serious shortcoming. She can be really stubborn. Although she didn't know the best way of getting to places, she insisted that she organize the trip properly. Now, I know that the proper way is always her way. I kept asking her, \e we coming back?\er whether she had looked at a map yet. Of course, she hadn't; my sister doesn't care about details. So I told her that the source of the Mekong is in Qinghai Province. She gave me a determined look—the kind that said she would not change her mind. When I told her that our journey would begin at an altitude of more than 5,000 metres, she seemed to be ex about it. When I told her the air would be hard to breathe and it would be very cold, she said it would be an interesting experience. I know my sister well. Once sh China Sea. e has made up her mind, nothing can change it. Finally, I had to give in. was autumn,thSeveral months before our I went to the library. We found a large atlas with good maps that showed details of world geography. From the atlas we could see that the Mekong River begins in a glacier on a Tibetan mountain. At first the river is small and the water is clear and cold. Then it begins to move quickly. It becomes rapids as it passes through deep valleys, travelling across western Yunnan Province. Sometimes the river becomes a waterfall and enters wide valleys. We were both surprised to learn that half of the river is in China. After it leaves China and the high altitude,the Mekong becomes wide，brown and warm. Ascited it enters Southeast Asia, its pace slows. It makes wide bends or meanders through low valleys to the plains where rice grows. At last, the river delta enters the SouthPART2 A NIGHT IN THE MOUNTAINS Although ite snow was alr trip,Wang Wei andeady beginning to fall in Tibet.Our legs were so heavy and cold that they felt like blocks of ice.Have you ever seen snowmen ride bicycles?That’s what we looked like! Along the way children dressed in long wool coats stopped to look at us.In the late afternoon we found it was so cold that our water bottles froze..However,the lakes shonelike glass in the setting sun and looked wonderful.Wangwei rode in front of me as usual.She is very reliable and I knew I didn nee to encourage her. To climb the mountains was hard work but as we looked around us, we were surprised by the view. We seemed to be able to see for miles. At one point we were so high that we found ourselves cycling through clouds. Then we began going down the hills. It was great fun especially as it gradually became much warmer. In the valleys colourful butterflies flew around us and we saw many yaks and sheep eating green grass. At this point we had to change our caps, coats,gloves and trousers for T-shirts and shorts. In the early evening we always stop to make camp.We put up our tent and then we eat. After supper Wang Wei put her head down on her pillow and went to sleep but I stayed awake. At midnight the sky became clearer and the stars grew brighter. It was so quiet. There was almost no wind—only the flames of our fire for company. As I lay beneath the stars I thought about how far we had already travelled. We will reach Dali in Yunnan Province soon, where our cousins Dao Wei and Yu Hang will join us. We can hardly wait to see them!PART THE END OF OUR JOUNEY ambodia was in many ways similar to Laos, although it has twice the population. At another inn, we talked with a teacher who old us that half of the people in her country couldn’t read orwrite. Her village couldn’t even afford to build a school, so she had to teach outside under a large tent. When we said goodbye, we all felt very lucky to have studied in college.Back on the road, we passed between many hills and forests. Then we came to the plains and entered Phnom Penh,the capital of Cambodia. In many ways it looked like Vientiane and Ho Chi Minh City; it also had wide streets with trees in rows and old French houses.Unlike Vientiane, ships could travel the Mekong River here.In the center of the city we visited the palace and a beautiful white elephant. It can only be seen outside the palace on special days. We ate an early supper and went to see a great temple with floors made of sliver. The next morning our group slept late. We were very tired from the long bike ride the day before.
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