3. If one wants to work more efficiently at his low point in the morning, he should _______.A. change his energy cycleB. overcome his lazinessC. get up earlier than usual D. go to bed earlier 本题要求读者找出文章第三段中的最后两句，并联系本段开头两旬的意思，作出正确判断 。文章第三段开头说，"虽然你无法改变自己的能量周期，但你可以使你的生活适合这一周期 。Dr. Kleitman认为经常性的行为(对你的能量周期)能起作用 。"最后两句又说，"…rise before your usual hour…work beaer at your low point．"("如果你在上午处于能量的低潮，但你有重要的工作要在上午做，那么你就要比平时早起 。这并不改变你的周期，但你可以在低潮时得到能量，工作得更好 。")因此选项C是正确答案 。
4. You are advised to rise with a yawn and stretch because it will ______.A. help to keep your energy for the day\'s workB. help you to control your temper early in the day C. enable you to concentrate on your routine work D. keep your energy cycle under control all day 本题问的是因果关系 。回答这一问题的关键是看懂文章最后一段的第二句和其他句子的联系 。首先要注意这一段的第一句"Get off to a slow start which saves your energy"，也就是说早上慢慢起床可以节省能量 。紧接该句的三个句子都是慢慢起床的具体做法 。因此选项A是正确答案 。
例2We all know that the normal human daily cycle of activity is of some 7-8 hours\' sleep alternating with some 16-17 hours\' wakefulness and that, broadly speaking, the sleep normally coincides with the hours of darkness. Our present concern is with how easily and to what extent this cycle can be modified.The question is no mere academic one. The ease, for example, with which people can change from working in the day to working at night is a question of growing importance in industry where automation calls for round-the-clock working of machines. It normally takes from five days to one week for a person to adapt to a reversed routine of sleep and wakefulness, sleeping during the day and working at night. Unfortunately, it is often the case in industry that shifts are changed every week; a person may work from 12 midnight to 8 a.m. one week,8 a.m. to 4 p.m. the next, and 4 p.m. to 12 midnight the third and so on. This means that no sooner has he got used to one routine than he has to change to another, so that much of his time is spent neither working nor sleeping very efficiently.The only real solution appears to be to hand over the night shift to a number of permanent night workers. An interesting study of the domestic life and health of night-shift workers was carried out by Brown in 1957. She found a high incidence of disturbed sleep and other disorders among those on alternating day and night shifts, but no abnormal occurrence of these phenomena among those on permanent night work.This latter system then appears to be the best long-term policy, but meanwhile something may be done to relieve the strains of alternate day and night work by selecting those people who can adapt most quickly to the changes of routine. One way of knowing when a person has adapted is by measuring his body temperature. People engaged in normal daytime work will have a high temperature during the hours of wakefulness and a low one at night; when they change to night work the pattern will only gradually go back to match the new routine and the speed with which it does so parallels, broadly speaking, the adaptation of the body as a whole, particularly in terms of performance. Therefore, by taking body temperature at intervals of two hours throughout the period of wakefulness it can be seen how quickly a person can adapt to a reversed routine, and this could be used as a basis for selection. So far, however, such a form of selection does not seem to have been applied in practice.1. The best solution for implementing the 24-hour working system seemsA. to change shifts at longer intervals B. to have longer shiftsC. to employ people who work on night shifts onlyD. to create better living conditions for night workers本题考核读者对文章具体内容的理解 。这需要联系和概括第三段的第一句和第四段第一句的意思 。第三段第一句说，"要真正解决这个问题似乎只有把夜班活固定地交给一批长夜班的工人去干" 。第四段第一句又说，"这种专人干长久的夜班的方法看来不失为最佳的长远之计" 。所以选项C是正确答案 。

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