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  3. During the rest of sleep, the fatigue of the body disappears. The tired mind gathers new energy; the memory improves; and proble

During the rest of sleep, the fatigue of the body disappears. The tired mind gathers new energy; the memory improves; and proble

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问题     During the rest of sleep, the fatigue of the body disappears. The tired mind gathers new energy; the memory improves; and problems are seen in better perspective (观点).
    Some adults require little sleep; others need eight to ten hours in every twenty-four. Infants sleep sixteen to eighteen hours daily, the amount gradually going less as they grow older. Young students may need twelve hours; university students may need ten. A worker with a physically demanding job may also need ten, whereas an executive working under pressure may manage on six to eight. Many famous people are repute to have required little sleep. Napoleon Bonaparte, Thomas Edison, and Charles Darwin apparently averaged only four to six hours a night.
    (77) Whatever your individual need, you can be sure that by the age of thirty you will have slept for a total of more than twelve years. By that age you will also have developed a sleep routine; a favorite hour, a favorite bed, a favorite posture (姿势), and a formula (程式) you need to follow in order to rest comfortably.
    (78)Investigators have tried to find out how long a person can go without sleep. Several people have reached more than 115 hours nearly five days. Whatever the limit, it is absolute. Animals kept awake for from five to eight days have died of exhaustion. The limit for human beings is probably about a week.
The longest time a human being can survive without sleep is probably ______.
选项 A、five days
B、seven days
C、ten days
D、twelve days
答案B
解析 由最后一句话The limit for human beings is probably about a week．可知B正确。
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