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
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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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