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
Steady advances in digital memory technology are making mass-storage devices technologically ______ and increasingly cost-effective.
A．eligible
B．sustainable
C．probable
D．feasible
单项选择题
Since colonial times, black people in South Africa have been ______ by the white minority.
A．depressed
B．suppressed
C．oppressed
D．repressed
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