单项选择题

From the last sentence of the passage we can learn that （）

A．we can put noise under control if we take effective measures
B．sometimes we have to shout loudly so that others can hear us
C．shouting is the 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 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 before.

单项选择题

Laws recently introduced in some states have （）

A．reduced the number of convictions
B．resulted in fewer serious accidents
C．prevented bars from serving drunken customers
D．specified the amount drivers can drink