单项选择题

A．At low latitudes.
B．At mid-latitudes.
C．At high latitudes.
D．At high altitudes.
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单项选择题
A．Through the living-room window.B．Through the kitchen window.C．The door was unclosed.D．The neighbor gave the key.
A．Through the living-room window.
B．Through the kitchen window.
C．The door was unclosed.
D．The neighbor gave the key.
单项选择题
Though only a few people suffer from some form of insomnia, you still have a chance to get it treated.
A．Y
B．N
C．NG
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