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

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

选项 A、total
B、increased
C、collective
D、cumulative

答案D

解析 语义连贯题。所填词能够修饰effect,并且这种影响是由于一段时间的睡眠缺乏引起的,所以选[D]cumulative“累积的,累加的”。[A]total“总的”,修饰number,amount,cost等词;[B]increased“增长的”;[C]collective“集体的,共同的”,是相对于单个个体来说的。
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