单项选择题

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

A．slip
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
单项选择题
A．byB．forC．toD．with
A．by
B．for
C．to
D．with
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