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
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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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