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
It has been revealed that some doctors have a history of abusing that trust for profit, ______ unnecessary and ineffective diet regimes to all comers.
A．delivering
B．ordering
C．advising
D．prescribing
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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