单项选择题


A．taken
B．considered
C．defined
D．thought
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单项选择题
The word offset in the second paragraph could be replaced by_______.
A．slip into
B．make up for
C．set up
D．catch up with
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 damaged effect on health
D．existed merely in urban and industries areas.
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