单项选择题

The word "offset" in the second paragraph could best be replaced by______.

A．slip into
B．make up for
C．set up
D．catch up with
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单项选择题
As pointed out at the beginning of the passage, people used to think that air pollution______.
A．caused widespread damage in the countryside
B．affected the entire eastern half of the United States
C．had damaging effects on health
D．existed merely in urban and industrial areas
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