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
Some would consider that an infringement of good manners whereas others would not.
A．an example
B．a violation
C．a problem
D．an indication
单项选择题
Biologists have ascertained that specialized cells convert chemical energy into mechanical energy.
A．determined
B．argued
C．pretended
D．hypothesized
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