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
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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.
单项选择题
It can be inferred from the passage that ______.
A．raising the world's temperature only a few degrees would not do much harm to life on earth
B．lowering the world's temperature merely a few degrees would lead many major farming areas to disaster
C．almost no temperature variations have occurred over the past decade
D．the world's temperature will remain constant in the years to come
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