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

As is 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 damaging effects on health
D．existed merely in urban and industrial areas

单项选择题

It can be inferred from the passage that people's views on beauty are often ______.

A．practical
B．prejudiced
C．old-fashioned
D．radical