单项选择题

This passage is primarily concerned with______.

A．the greenhouse effect
B．the bunting 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 damaging effects on health
D．existed merely in urban and industrial areas
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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