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 befor

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