During the rest of sleep,the fatigue of the body disappears. The tired mind gathers new energy;the memory improves;and troubles and problems are seen in better perspective. Some adults require little sleep;others need eight to ten hours in every twenty-four. Infant sleep sixteen to eighteen hours daily,the amount gradually going less as they grow older. Your students may need twelve hours;university students may need ten. A worker with a physical demanding job may also need ten,whereas an executive working under great pressure may manage on six to eight. Many famous people are reputed to have required little sleep. Napoleon Bonaparte,Thomas Edison,and Charles Darwin apparently averaged only four to six hours a night.
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:favorite hour,a favorite bed,a favorite posture,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. 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.
6、The writer implies that ( A )。
A、sleep is important for good mental and physical health B、a light sleep is as restful as a deep sleep
C、memory is improved during sleep D、sleep is relatively unimportant for human beings
7、From the amount of sleep Napoleon,Edison,and Darwin required,we can conclude( D )。
A、that they were famous.
B、that they were executives
C、that they were intelligent
D、None of the above
8、The amount of sleep required may ( D )。
A、vary greatly from one individual to another
B、depend on an individual's age
C、be related to an individual's occupation
D、All of the above.
9、If a person is not allowed to follow his before-slept routine,he will probably( A )。
A、not sleep well
B、never fall asleep
C、lose his memory
D、begin to daydream
10、The longest time a human being can survive without sleep is probably( C )。
A、five days
B、ten days
C、seven days
D、twelve days
山东现代网络远程教育报名学习中心2012年秋季学籍各大高校网络远程教育专/本科报名进行中,具体招生专业,入学考试时间科目等请欢迎电话咨询:0531-58651558 QQ 328524468221.