单项选择题

A) retreat C) releases
B) reduce D) refrain

A．retreat
B．reduce
C．releases
D．refrain
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单项选择题
A) whatever C) whenever B) no matter D) whether
A．whatever
B．no matter
C．whenever
D．whether
单项选择题
A) diversity C) generalization B) extinction D) degradation
A．diversity
B．extinction
C．generalization
D．degradation
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