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
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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
单项选择题
Duke Ellington' s______ orchestration techniques made him perhaps the most remarkable artist that jazz has produced.
A．clever
B．melodious
C．intricate
D．lyrical
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