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

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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 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

单项选择题

Which of the following factors is NOT mentioned as affecting the tide（）

A．the sun
B．the depth of the ocean
C．the moon
D．the winds