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单项选择题

A．Electricians.B．Environmentalists.C．Aviators.D．Teacher……

Tile author raises issues that would most concern which of the following groups


A．Electricians.
B．Environmentalists.
C．Aviators.
D．Teachers.
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单项选择题The author mentions people dying of air pollution in ______.

A．Illinois
B．Pennsylvania
C．New Jersey
D．Washington

单项选择题Scientists are trying to find a link between pollution and ______.

A．intelligence levels
B．antisocial behavior
C．birth defects
D．divorce percentage

单项选择题Scientists have not yet determined ______.

A．all of the effects of pollution on the human body
B．how pollution can be controlled successfully
C．when the atmosphere first became polluted
D．how to wash the black snow clean

单项选择题Air pollution causes airplane accidents because ______.

A．pilots become ill
B．visibility is reduced
C．engines fail.
D．the air is too hot

单项选择题We can conclude that ______.

A．civilization may be doomed if pollution is not controlled
B．pollution is more serious in Europe than it is in America
C．most people do not know that pollution is a serious problem
D．black snow is not so serious compared with white snow