单项选择题

Generally speaking, the eastern American cities are (more) ______ than the western ones.

A. populous and industrialized
B. sparsely populated and agricultural
C. bigger and richer
D. smaller and poorer
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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
填空题
vitamins
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