单项选择题

The very north and south regions are covered with ice and snow.

A. areas
B. rocks
C. mountains
D. districts
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单项选择题
The girl is gazing at herself in the mirror.
A．smiling
B．laughing
C．shouting
D．staring
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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