单项选择题

From the last sentence of the passage we can learn that______.

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

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单项选择题

When the writer says we cannot return the good old days, he means that ______.

A．our society is becoming much worse than before
B．in our modem 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

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 the danger of noise before.