单项选择题

American companies are evolving from mass - production manufacturing to ______ enterprises.

A．moveable
B．changing
C．flexible
D．varying
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单项选择题
If businessmen are taxed too much, they will no longer be motivated to work hard, with the result that incomes from taxation might actually ______.
A．shrink
B．delay
C．disperse
D．sink
单项选择题
Every chemical change either results from energy being used to produce the change, or causes energy to be ______ in some form.
A．given off
B．put out
C．set off
D．used up
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