单项选择题


A．A month's
B．A month
C．A months
D．Month's
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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
单项选择题
What does this passage mainly talk about
A．The greenhouse effect.
B．The burning of fossil fuels.
C．The potential effect of air pollution.
D．The likelihood of a new ice age.
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