单项选择题

Trees ______ themselves by seeds.

A．cultivate
B．grow
C．enrich
D．propagate
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单项选择题
Once you get to know your mistakes, you should ______ them as soon as possible.
A．rectify
B．reclaim
C．refrain
D．reckon
单项选择题
The energy ______ by the chain reaction is transformed into heat.
A．transferred
B．released
C．delivered
D．conveyed
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