全新版大学英语 - 视听阅读4Unit1答案

II. Listen again. Choose the best answer to each of the following questions.

1. Which one of the following statements is NOT the function of a cicada's noises?B A. To show it's frightened or caught.

B. To attract groups of males and females. C. To frighten other males and females. D. To call for mating.

2. Why can these insects do some minor damage to vegetation?C

A. Because female cicadas bite the leaves. B. Because female cicadas feed on branches.

C. Because female cicadas make holes in tree branchs.

D. Because female cicadas feed on the underground roots of trees.

3. What is the suitable temperature for the cicadas to start coming out of their holes?A A. 17.8 Celsius. B. 18.8 Celsius. C. 19.8 Celsius. D. 20.8 Celsius. 4. Where do the cicada killers live?B A. In a tree. B. Underground.

C. On the grassland. D. In a forest.

5. When do the 13- and 17-year varieties of cicadas that emerge in May or June die?C A. By May. B. By June. C. By July. D. By August.

III. Listen and repeat. You are going to hear five sentences selected from the audio. Repeat each sentence after it is spoken twice. Then write the sentences. 1. One way to identify a cicada is by its distinctive call.

2. The exact day of their emergence is determined by how warm the weather is.

3. The cicada killer is a large bee-like insect that, like the cicada, spends most of its life underground.

4. To provide food for her young, the female of the species stings a cicada and carries it back to her nest.

5. Cicada killers are beneficial in that they help control the cicada population which can threaten trees if they become too numerous.

IV. Oral work. Work with a partner. List all the facts you have learned about the cicada and its characteristics, its life cycle and the types of cicadas, and the cicada killer. Then summarize the information and present it to the class. If possible, search the Internet to find some pictures to support your presentation.

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