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
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
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 the 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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