A、Sometimes we have to shout loudly so that others can hear us. B、Noise pollution is the worst kind of pollution we suffer from.

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问题  
The sense of sound is one of our most important means of knowing what is going on around us. Sound has a waste product, too, in the form of noise. Noise is growing and it may get much worse before it gets any better.
    Scientists have been studying how noise affects people and animals. They are surprised by what they have learned. Peace and quiet are becoming harder to find.
    Noise pollution is a threat that should be looked at carefully.
    There is a saying that it is so noisy that you can’t hear yourself think. Doctors who study noise believe that we must sometimes hear ourselves think. If we don’t, we may have headaches, other aches and pains, or even worse mental problems.
    Ways of making less noise are now being tested. There are even laws controlling noise. We cannot return to the "good old days" of peace and quiet. But we can reduce noise, if we shout loudly enough about it.
19. Why are scientists surprised by the findings in their noise study?
20. What may happen if we cannot hear ourselves think?
21. Which of the following is true according to the passage?

选项 A、Sometimes we have to shout loudly so that others can hear us.
B、Noise pollution is the worst kind of pollution we suffer from.
C、We can put noise under control if we take effective measures.
D、Our environment is getting much better except for the pollution.

答案C

解析 本题属于是非筛选型细节题。C是对文章最后一句深层意义的解释,原文中的shout并非表示“大喊大叫”,而是“呼吁”的意思。因此选C。A利用shout loudly进行语音干扰;B错在worst,文中只提到噪音污染是我们应该认真看待的一种威胁;D在文中并未提及。本题的另一种解法:从常识及逻辑的角度来看,只有C最合情合理;而A、D不是太合情理,B的表述过于绝对。由此推断,答案为C。
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