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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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
Some fish have a greater _______ for acid water than others.
A．tolerance
B．resistance
C．dependence
D．persistence
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