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lead. This reaction is then registered by the Bluetooth reader, which sends a signal to a mobile app that can tell you immediately if your water is safe to drink.

Rao appropriately named the device Tethys after the Greek goddess of fresh water, and is hoping to make a little improvement to get the device on the market. While we may not be aware of any lead pollution present in our aging pipelines, lead poisoning can cause delays in physical and mental development. With Rao believing that the “purpose of science is to make a difference”, her incredible invention could make a difference to millions of people in the United States.

24. What do we know about Rao’s device?

A. It’s cheap and quick.

C. It’s expensive and reliable. consuming.

D. It’s portable and time-B. It’s cheap and inaccurate.

25. What made Rao have the idea of designing the device?

A. Her parents’ suggestions.

B. The name of the Greek goddess.

C. Her interest in settling real problems.

D. The water pollution litigation in Flint.

26. What do the carbon nanotubes function as?

A. Sending immediate signals.

B. Recording the reaction results.

C. Detecting the presence of lead.

D. Showing the water quality results.

27. What does the author think of Rao’s invention?

A. It will lead Rao to make a fortune.

B. It will help millions of Americans drink safe water.

C. It will promote the development of science in America.

D. It will soon settle the lead-polluted problem thoroughly.

C

Imagine jet-setting from Tokyo to Paris, enjoying first-class travel, a four-course dinner and a city tour－all without leaving the ground. This is the future of air travel according to Japanese company First Airlines, which has used the power of virtual reality to create dream vacations.

Passengers avoid the costly airport transfer, the baggage fees or busy airport terminal（航站楼）－and instead enjoy the privileges of business or first-class travel and an expensive tour of Paris－all while remaining motionless in Tokyo. As well as Paris, First Airlines also offers the virtual destinations of New York,

Rome and Hawaii.

After boarding, guests can settle down for the two-hour flight on their advanced Airbus seat－surrounded by decoration that is modeled on the inside of an aircraft, for maximum realism. There is flight service and VR, foods, music for every destination. Passengers will be served a delicious meal by air stewards, alongside drinks and other desserts. The menu depends on the destination of choice－Manhattan clam chowder and cheesecake for New York and salmon tartar and onion soup for Paris. After landing at the destination, guests can enjoy a 360-degree tour of the destination－all thanks to projection（投影）mapping and video.

It makes for a supposedly stress-free vacation, perfect for those whose ability to travel abroad is limited by cost

or health. Virtual reality is becoming increasingly present everywhere at all times in the world of travel－allowing