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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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.
单项选择题
The author mentions people dying of air pollution in ______.
A．Illinois
B．Pennsylvania
C．New Jersey
D．Washington
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