单项选择题

This passage is primarily concerned with the ______.

A．greenhouse effect
B．burning of fossil fuels
C．potential effect of air pollution
D．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 the 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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