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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单项选择题
If too many of these rare animals are killed, their kind will _______.
A．die away
B．die down
C．die out
D．die from
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
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