2. 外语
  3. During sleep, the fatigue (疲劳) of the body 【S1】______ and recuperation (恢复) begins. The tired mind gathers new energy. Once awak

During sleep, the fatigue (疲劳) of the body 【S1】______ and recuperation (恢复) begins. The tired mind gathers new energy. Once awak

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问题 During sleep, the fatigue (疲劳) of the body 【S1】______ and recuperation (恢复) begins. The tired mind gathers new energy. Once awake, the memory improves, and annoyance and problems are seen in a better 【S2】______ .
    Some adults require little sleep; others need eight to ten hours in every twenty-four. 【S3】______ sleep sixteen to eighteen hours daily and, as they grow older, the 【S4】______ gradually diminishes. Young students may need twelve hours; university students may need ten. A worker with a 【S5】______ demanding job may also need ten, whereas an executive worker under great pressure may manage on six to eight. Many famous people are reputed to have required little sleep. Napoleon, Thomas Edison and Charles Darwin apparently 【S6】______ only four to six hours a night.
    Whatever your 【S7】______ 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 【S8】______ : a favorite hour, a favorite bed, a favorite position, and a formula you need to follow in order to rest comfortably.
    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, 【S9】______ animals kept awake for from five to eight days have died of exhaustion. The 【S10】______ for human beings is probably about a week.

A disappears        B amount          C perspective        D Infants
E routine           F limit           G physically         H individual
I averaged          J data            K whereas            L People
M doubtful          N entertain       O instinct
【S10】
选项
答案F
解析 上文提到有关人能坚持多久不睡的调查，由此可推测空格所在句指的是人不睡眠的极限时间，故F符合文意
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