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  3. The sense of sound is one of our most important means (方法，手段) of knowing what is going on around us. Sound has a wasted product,

The sense of sound is one of our most important means (方法，手段) of knowing what is going on around us. Sound has a wasted product,

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问题    The sense of sound is one of our most important means (方法，手段) of knowing what is going on around us. Sound has a wasted product, too, in the form of noise. Noise has been called unwanted sound. Noise is growing and it may get 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 about it being 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 the 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 can’t 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 our measures are effective
B、sometimes we have to shout loudly so that others can hear us
C、shouting is a chief cause of noise pollution
D、it is important to warn people of the danger of noise pollution
答案D
解析 本题考查对句意的正确理解：最后一句话“But we can reduce noise—if we shout loudly, enough about it”的意思是“但我们能够减少噪音——如果我们大声疾呼的话”。根据常识，这里大声疾呼指的是提醒人们。本题答案为[D]。
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