2.What is the researchers' concern over the increase of birds' song output？

　　A. The environment might be polluted.

　　B. The birds' health might be damaged.

　　C. The industry cost might be increased.

　　D. The people's hearing might be affected.

　　答案与解析　B　考查细节理解。根据第一段中的“But robins are in danger of wearing themselves out by singing too much”及第四段中的最后一句可知答案为B。

　　3.What does the underlined word “nocturnal” in Paragraph 5 mean？

　　A. Active at night.

　　B. Inactive at night.

　　C. Active during the day.

　　D. Inactive during the day.

　　答案与解析　A　考查词义猜测。根据画线词所在段中的“being kept awake”及“During the breeding (繁殖) season, between April and June, they are very active at night”可知，nocturnal的意思应是“夜间活动的”，故选A。

　　4.Why do some birds thrive in noisy environments？

　　A. Because there are fewer dangers.

　　B. Because there is more food to eat.

　　C. Because there is less light pollution.

　　D. Because there are more places to take shelter.

　　答案与解析　A　考查推理判断。根据最后一段中的“It is thought that they are capitalising on their predators (天敌) fleeing to quieter areas”可推知A项正确。

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