单项选择题

A．See if the walkman is working.
B．Listen to the radio.
C．Listen to some music.
D．Fix it if her thinking is right.
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单项选择题
A．High, dry mountains.B．Rivers and oceans.C．Damp, swamp areas.D．Mountain forests.
A．High, dry mountains.
B．Rivers and oceans.
C．Damp, swamp areas.
D．Mountain forests.
单项选择题
The difficulty to control the AIDS is that the vaccines are very expensive.
A．Y
B．N
C．NG
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