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

I can't put up with my neighbor's noise any longer；it's driving me mad．

A．measure
B．generate
C．tolerate
D．reduce

单项选择题

I don't quite follow what she is saying.()

A. believe
B. understand
C. explain
D. accept

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