单项选择题

Sleep______ can result in mental disorders such as memory loss, obsession.

A．deprivation
B．destruction
C．reduction
D．restriction
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单项选择题
He is______ to have demanded a ransom of one million.
A．accused
B．alleged
C．addressed
D．advocated
单项选择题
Investment in new product development is an essential______ of corporate success.
A．element
B．component
C．ingredient
D．constituent
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