单项选择题

According to Nick, what should the government do to prevent pollution

A．To make laws to prevent pollution.
B．To set good examples to prevent air pollution.
C．To punish those who pollute the air.
D．To move offices to the countryside.
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单项选择题
Why has the most drastic reduction in wildlife occurred in North America
A．Because air pollution has been very serious there.
B．Because animals there have been killed by lions.
C．Because people there only want some animal representatives.
D．Because of the very rapid transition from a rural to a highly industrialized society there.
填空题
retreating.
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