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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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
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