单项选择题

Nowadays many multinational companies are evolving from mass production manufacturing to ________enterprises.

A．moveable
B．mobile
C．flexible
D．versatile
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单项选择题
Only when ________with water can this liquid be used to clean wounds.
A．purified
B．devised
C．diluted
D．vaporized
单项选择题
Is there any possible ________explanation for his bad health since he seems to have no obvious disease
A．psychiatric
B．psychological
C．surgical
D．physical
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