单项选择题

What may happen if we cannot hear ourselves think（）

A．We may forget what we have thought about.
B．Our thoughts may be disturbed.
C．Our mind may be harmed.
D．We may have difficulty finding the right words.

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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

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.