单项选择题

During a period of sleep deprivation the effects of sleeplessness may become ______.

A．total
B．increased
C．collective
D．cumulative
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单项选择题
The results of the experiments were ______ and they will have to be done again.
A．opaque
B．ambiguous
C．obscure
D．illegible
单项选择题
Carl was deeply ______ by the frequent traffic delays and vowed to do something about it.
A．deported
B．deprived
C．involved
D．frustrated
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