2. 专升本
  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 amount of sleep required may______.
选项 A、tire an individual mind
B、help infants grow older
C、apply pressure to an executive
D、depend on an individual age
答案D
解析 根据第二段第一、二句“Some adults require lime sleep；others need eight to ten hours in every twenty-four hours. Infants sleep sixteen to eighteen hours dail，the amount gradually diminishing as they grow older．”可知，有些成年人需要很少的睡眠，其 他人每天需要8到10个小时睡眠；婴儿每天需要睡16到18个小时，随着年龄的增 长，所需的睡眠数量也逐渐减少。由此可推知，人们需要的睡眠时间取决于个人年 龄。故选D。
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