单项选择题

As one of the youngest professors in the university, Longfellow is certainly on the ______ of a brilliant career.

A．porch
B．edge
C．threshold
D．fringe
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单项选择题
The king was totally unaware that his reign was at ______.
A．danger
B．question
C．stake
D．hazard
单项选择题
Feeling that she was in the right, the old lady took ______ at the dirty remark.
A．protection
B．offence
C．defense
D．guard
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