单项选择题

Mother told me to take an umbrella with me; it might come in handy, she said.

A．be convenient
B．be useful
C．get cloudy
D．start raining
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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
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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