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
It can be concluded 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
单项选择题
As to the greenhouse effect, 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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