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  3. The sense of sound is one of our most important means of knowing what is going on around us. Sound has a waster product, too, in

The sense of sound is one of our most important means of knowing what is going on around us. Sound has a waster product, too, in

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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 waster product, too, in the form of noise. Noise has been called unwanted sound. Noise is growing and it may get much worse before it gets any better.
    Scientists, for several years, 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.
    Noise adds more tension (紧张) to a society that already faces enough stress.
    But noise is not a new problem. In ancient Rome, people complained so much about noise that government stopped chariots (四轮马车) from moving through the streets at night!
    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.
From the last sentence of the passage we can learn that ______.
选项 A、we can put noise under control if we take effective measures
B、sometimes we have to shout loudly so that others can hear us
C、shouting is the chief cause of noise pollution nowadays
D、it is important to warn people of the danger of noise pollution
答案D
解析 本题为理解题。文章最后一句话是说，如果我们大声呼吁的话，我们是可以减少噪音的。也就是说我们应该让更多的人了解噪音污染的害处，增强保护意识，这才是主要的任务。因此应选D。
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