单项选择题

The synergy of humans, society and machines is the fundmental cause of the unparalleled material prosperity of many nations.

A．unpopular
B．unpredictable
C．unquestionable
D．unprecedented
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单项选择题
For many years the poor woman was a virtual prisoner in her own home.
A．a real prisoner
B．a prisoner by law
C．an unreal prisoner
D．in effect a prisoner
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