单项选择题

At last they _______ three figures moving in the distance.

A．turned out
B．made out
C．worked out
D．found out
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单项选择题
Some fish have a greater _______ for acid water than others.
A．tolerance
B．resistance
C．dependence
D．persistence
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
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