单项选择题

A．High, dry mountains.
B．Rivers and oceans.
C．Damp, swamp areas.
D．Mountain forests.
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单项选择题
The difficulty to control the AIDS is that the vaccines are very expensive.
A．Y
B．N
C．NG
单项选择题
A．It was a twenty-volume work.B．It was a complete list of difficult words.C．It showed word histories.D．It gave good meanings to each word.
A．It was a twenty-volume work.
B．It was a complete list of difficult words.
C．It showed word histories.
D．It gave good meanings to each word.
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