单项选择题

Air pollution causes airplane accidents because ______.

A．pilots become iii
B．visibility is reduced
C．engines fail.
D．the air is too hot
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单项选择题
According to the passage, the characteristic of a highly technological society is ______.
A．its electronic technology
B．people's way of living
C．wide use of television
D．its rapidness and efficiency in doing things
单项选择题
What makes American people more pessimistic
A．The fast pace and complicated way of life.
B．Too much leisure time.
C．Loose relationship between people.
D．All of the abov
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