四級英語閱讀提升訓(xùn)練原文

　　To determine the consequences of sleep deficit,researchers have put subjects through a set of psychological and performancetests requiring them, for instance, to add columns of numbers or recall apassage read to them only minutes earlier. "We've found that if you're insleep deficit, performance suffers," says Dr. David. “Short-term memory isweakened, as are abilities to make decisions and to concentrate.”

　　四級英語閱讀提升訓(xùn)練題目

　　1. People in the 18th and 19th centuries used to sleep about 9.5 hoursa night because they

　　had _______ .

　　A) no drive and ambition B) noelectric lighting

　　C) the best sleep habits D)nothing to do in the evening

　　2. According to Dr. David, Americans _______ .

　　A) areideally vigorous even under the pressure of life

　　B) ofienneglect the consequences of sleep deficit

　　C) do notknow how to relax themselves properly

　　D) can getby on 6.5 hours of sleep

　　3. Many Americans believe that _______ .

　　A) sleep isthe first thing that can be sacrificed when one is busy

　　B) they needmore sleep to cope with the complexities of everyday life

　　C) to sleepis something one can do at any time of the day

　　D) enoughsleep promotes people's drive and ambition

　　4. The word “subjects” (Line 1, Para. 4) refers to______ .

　　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

　　四級英語閱讀提升訓(xùn)練答案講解

　　1.B答案見第2段第1句。18、19世紀(jì)的時(shí)候，首先是因?yàn)闆]有電燈照明，所以人們晚上才無事可做，只好早早睡覺。而不是D項(xiàng)所說，是由于無事可做才多睡。

　　2.B全篇多處提到Dr.David的看法，在文中找到有Dr.David說話的地方，綜合比較一下，不難看出Dr.David認(rèn)為美國人經(jīng)常忽視睡眠不足的后果。

　　3.A答案見第2段倒數(shù)第1、2句和第3段第1、2句。

　　4.C最后一段一開始就講，為了確定睡眠不足所產(chǎn)生的后果，研究人員讓subjects通過一系列心理和行為的測試，要求他們把一欄數(shù)字相加或者回憶剛讀過的文章。這樣看來，subjects應(yīng)該是指人了。

　　5.D推理題，依據(jù)見本文最后兩句話。其實(shí)，也只有D項(xiàng)才把睡眠充足所帶來的好處講得最完整。