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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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 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

The word offset in the second paragraph could best be replaced by______.

A．slip into
B．make up for
C．set up
D．catch up with