单项选择题

Why are scientists surprised by the findings in their noise study

A．Because the world is becoming more and more noisy.
B．Because they have learned that noise is also a kind of pollution.
C．Because noise is an unwanted waste for human beings.
D．Because people knew little about noise befor
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单项选择题
Which of the following is TRUE according to the passage
A．Only recently did people realize the harmful effect of noise.
B．Noise pollution is the worst kind of pollution we suffer from.
C．People are now trying to find ways to make noise as low as possible.
D．The writer thinks that it is almost impossible for people to avoid nois
单项选择题
When the writer says we cannot return to the good old days, he means that ______
A．our society is becoming much worse than before
B．in our modern society it is hard to lead a quiet life
C．the old days were much happier than the present time
D．it is impossible for us to deal with noise as we did before
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