单项选择题

This passage is primarily concerned with _____.

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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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
单项选择题
As far as the greenhouse effect is concerned, 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
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