单项选择题

The temperature of the atmosphere becomes colder as elevation increases.

A．altitude
B．aptitude
C．latitude
D．longitude
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单项选择题
We managed to reach the top of the mountain, and half an hour later we began to ____.
A．decline
B．ascend
C．descend
D．plunge
单项选择题
Losing the job was bad, but even worse was the feeling that I had ____ my dear wife and children.
A．let alone
B．let down
C．let off
D．let up
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