单项选择题

When plutonium undergoes fission, its atoms break apart, giving off a great deal of energy

A．recoil
B．soften
C．fester
D．split
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单项选择题
Regional planning deals with proposals concerning outlying communities and highways as well as with urban affairs.
A．outlandish
B．exclusive
C．exempted
D．remote
单项选择题
Ice can be used to keep food from spoiling.
A．rotting
B．aging
C．toughening
D．evaporating
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