单项选择题

Prohibition in the United States ushered in an era of crime and corruption.

A．introduced
B．caused
C．used
D．upset
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单项选择题
The Pullman Strike of 1894 tied up transportation and was finally ended only by government intervention.
A．relied upon
B．hindered
C．linked with
D．imitated
单项选择题
In arithmetic, a number stands for the size of a set of things.
A．measures
B．estimates
C．cancels
D．represents
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