单项选择题

As one of the youngest professors in the university, Miss King is certainly on the _______ of a brilliant career.

A．threshold
B．edge
C．porch
D．course
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单项选择题
He seems to be _______ enough to climb to the mountain top in an hour.
A．radiant
B．conscientious
C．conspicuous
D．energetic
单项选择题
Mary tried _______ to persuade her husband to give up smoking.
A．in line
B．in vain
C．at length
D．without fail
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