A) the performancetests used in the study of sleep deficit
B) specialbranches of knowledge that are being studied
C) peoplewhose behavior or reactions are being studied
D) thepsychological consequences of sleep deficit
5. It can be concluded fromthe passage that one should sleep as many hours as is necessary to ______ .
A) improveone s memory dramatically
B) beconsidered dynamic by other people
C) maintainone s daily schedule
D) feelenergetic and perform adequately
1.B答案见第2段第1句。18、19世纪的时候,首先是因为没有电灯照明,所以人们晚上才无事可做,只好早早睡觉。而不是D项所说,是由于无事可做才多睡。
2.B全篇多处提到Dr.David的看法,在文中找到有Dr.David说话的地方,综合比较一下,不难看出Dr.David认为美国人经常忽视睡眠不足的后果。
3.A答案见第2段倒数第1、2句和第3段第1、2句。
4.C最后一段一开始就讲,为了确定睡眠不足所产生的后果,研究人员让subjects通过一系列心理和行为的测试,要求他们把一栏数字相加或者回忆刚读过的文章。这样看来,subjects应该是指人了。
5.D推理题,依据见本文最后两句话。其实,也只有D项才把睡眠充足所带来的好处讲得最完整。
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