单项选择题

Almost all economists agree that nations gain by trading with one another.

A．work
B．profit
C．rely
D．prove
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单项选择题
The train came to an abruptstop, making us wonder where we were.
A．an uncertain
B．a slow
C．an unexpected
D．a smooth
单项选择题
If wool is put into hot water, it tends to shrink.
A．disappear
B．expand
C．break
D．contract
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