单项选择题

We managed to reach the top of the mountain, and half an hour later we began to ______ .

A．ascend
B．descend
C．decline
D．plunge
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单项选择题
The outline of the figure was barely ______ in the darkness.
A．susceptible
B．invisible
C．perceptive
D．perceptible
单项选择题
His career was not noticeably ______ by the fact that he had never been to college.
A．prevented
B．prohibited
C．hindered
D．refrained
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