21．According to the passage, which of the following is increasingly dangerous to sea creatures?

　　A．The sound of cars.　

　　B．The sound of voices.

　　C．Man­made noise pollution. D．The sound of steps.

　　答案：C　细节理解题。由第一段Some scientists say that animals in the oceans are increasingly threatened by noise pollution caused by human beings. 可知噪音污染引起了海洋生物的危险，故选C。

　　22．According to the passage, natural sounds include all of the following EXCEPT________.

　　A．sounds made by animals themselves

　　B．ocean drilling

　　C．underwater earthquakes

　　D．the breaking of ice fields

　　答案：B　细节理解题。由第二段These sounds include the breaking of ice fields, underwater earthquakes, and sounds made by animals themselves. 可知ocean drilling不是自然的声音，故选B。

　　23．Which of the following is true of whales？

　　A．They won't be confused by noises.

　　B．They are deaf to noises.

　　C．Their ability to reproduce will be lowered by high­level noises.

　　D．Their hearing will be damaged by high­level noises.

　　答案：D　推理判断题。根据第六段The research team found that powerful underwater explosions were causing whales in the area to lose their hearing.可知水下巨大的爆炸声会使鲸失去听力，故选D。

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