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
This passage is primarily 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
单项选择题
It is customary to leave a house
A．through the kitchen window
B．through a bedroom
C．by the door
D．down a drain-pipe
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