公共英语三级

单选题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 word soon

参考答案：B进入在线模考
第一段最后一句“If this view is correct．．．”表明作者只是引用这种现象并不确定其正确性。

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1The word "offset" in the second paragraph could be replaced by

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

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2It 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

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3This 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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