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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热门试题

单项选择题

The word offset in the second paragraph could be replaced by_______.

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

单项选择题

As pointed out at the beginning of the passage, people used to think that air pollution_______.

A．caused widespread damage in the countryside
B．affected the entire eastern half of the United States
C．had damaged effect on health
D．existed merely in urban and industries areas.