单项选择题

Decisions could be made on the basis of price, delivery dates, after-sales service or any other______.

A．variable
B．variance
C．variant
D．variation
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单项选择题
It has long been known that total sleep ______is 100 percent fatal to rats, yet, upon examination of the dead bodies, the animals look completely normal.
A．deposition
B．destruction
C．deprivation
D．reduction
单项选择题
When a child has become ______to life in a city, he may feel quite at a loss in any other environment.
A．addicted
B．confronted
C．conditioned
D．delimited
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