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
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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 half of the United States
C．had damaged effect on health
D．existed merely in urban and industries areas.
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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