单项选择题

Which of the following is TRUE according to the passage（）

A．Only recently did people realize the harmful effects of noise.
B．Noise pollution is the worst kind of pollution we suffer from.
C．People are now trying to find ways to reduce noise as much as possible.
D．The writer thinks that it is almost impossible for people to avoid nois

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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

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 befor