单项选择题

From the last sentence of the passage we can learn that ______.

A．we can get public noise under control if we effectively draw attention to it
B．sometimes we have to shout loudly so that others can hear us
C．shouting is a chief cause of noise pollution nowadays
D．it is important to warn people of the danger of noise pollution
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单项选择题
Why are scientists surprised by the findings in their noise study
A．Because the world is becoming increasingly noisy.
B．Because they have learned that noise is also is also a kind of pollution.
C．Because noise is an unwanted waste for human beings.
D．Because people knew little about noise before.
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 reduce noise back to previous levels
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