英语四级
填空题whereas an 3 .. worker under great pressure may manage on six to eight.
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【解析】选[O]。空后的名词及空前的all表明此处应填一以元音音素开头的形容词，故[J]acquired{习得的，养成的) 和[O]executive(执行的，有执行杈的)入选。空前的whereas(然而)是将前半句的干体力活的工人和脑力劳动的工人的睡眠时间相对比，[O]executive(执行的，有执行权的)符合语义。
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