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
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单项选择题
As to the greenhouse effect, the author ______.
A．shares the same view with the scientists
B．is uncertain of its occurrence
C．rejects it as being ungrounded
D．thinks that it will destroy the world soon
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 haft of the United States
C．had damaged effect on health
D．existed merely in urban and industries areas
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