单项选择题

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
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