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Life gets noisier every day and very few

admin2022-08-02  49
问题 Life gets noisier every day and very few people can free from noise of some sort or another. It doesn′ t matter where you live--in the middle of a modern city, or a faraway village--the chances that you will be disturbed by jet aero planes, transistor radios, oil powered engines, etc. , are almost everywhere. We seem to be getting used to noise, too. Some people feel quite lonely without back-ground music while they are working. Scientific tests have shown that total silence can be very frightening experience for human beings. However, some people enjoy listening to pop music which is very loud, and this can do harm to their eardrums(耳鼓). The noise level in some disco is far above the usual safety level for heavy industrial areas. One recent report about noise and concentration(专心,) suggested that although a lot of people say that any noise disturbs their concentration, what really affects their ability to concentrate is a change in the level of noise. It goes on to say that a background noise, which doesn′ t change too  much (music, for example) lnay even help people to concentrate.  Scientists have discovered that what prevents people from concentrating isA.any kind of noiseB.great changes in level of noiseC.background noiseD.various background music
选项 A.any kind of noise
B.great changes in level of noise
C.background noise
D.various background music
答案 B
解析 从第三段第一句可知，真正影响人们集中精力的是噪音级别的改变。
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