单项选择题

A book emphasizes AIDS ______ a disease, not a social problem, and discusses how it can be prevented.

A．for
B．on
C．with
D．as
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单项选择题
We have studied long and hard to ______ those objections.
A．overpay
B．overcome
C．win
D．omit
单项选择题
(The Chinese) were the first and (large) ethnic(种族) group (to work) on the construction (of) the transcontinental railroad system.
A．The Chinese
B．large
C．to work
D．of
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