单项选择题

The speculation,______ by some suggestive evidence, came from an American scientist.

A．summed up
B．backed up
C．added up
D．put up
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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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