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  3. After a day’ s hard work, we need some sleep. During the sleep, the fatigue of the body disappears and recuperation (恢复) begi

After a day’ s hard work, we need some sleep. During the sleep, the fatigue of the body disappears and recuperation (恢复) begi

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问题    After a day’ s hard work, we need some sleep. During the sleep, the fatigue of the body    disappears and recuperation (恢复) begins. The tired mind gathers new energy, and the memory    improves.
   Some adults require little sleep: others need eight to ten hours in every twenty-four hours.    Infants sleep sixteen to eighteen hours daily, the amount gradually diminishing 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 great pressure may manage on six to eight. Many famous people have little sleep. Napoleon Bonaparte, Thomas Edison and Charles Darwin apparently averaged only four to six hours a night.
   Whatever your individual need is, 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 position, and a rule 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. Whatever the limit, it is absolute. Animals that kept awake for from five to eight days have died of exhaustion. The limit for human beings is probably about a week.
The author implies that if human beings are kept awake for more than a week the result______.
选项 A、is hard to imagine
B、will probably be a mental breakdown
C、is difficult to describe
D、will probably be death
答案D
解析 根据最后一段最后两句" Animals that kept awake for from five to eight days have died of exhaustion. The limit for human beings is probably about a week. "可知，动物有5到8天不睡觉就会累死，而人类不睡觉的极限为一周左右。由此可推知，如果一个人超过一周不睡觉，那他很可能会丧命。故选D。
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