Sleep is very important．A person who does not sleep dies faster than a person who does not eat．We spend about a third(1/3)of our lives in sleep．That's about 121 days a year!How much sleep do we nee 题目和参考答案——青夏教育精英家教网—

17．

Sleep is very important．A person who does not sleep dies faster than a person who does not eat．We spend about a third（1/3）of our lives in sleep．That's about 121 days a year!
How much sleep do we need？We are all different．A baby needs 16 hours of sleep every day．Children 6 to 12 years old need an average（平均） of 10 to 12 hours of sleep．Teenagers need 9 to 10 hours of sleep．An adult needs an average of 7 to 8hours a night．There are some people who need only 3 hours of sleep．Others need 10 hours of sleep．After the age of 50，the average sleep time goes down to 6.5 hours a night．We need less sleep as we get older．
About one in three Americans has a problem with sleep．Many of these people can not fall asleep．The name of this problem is insomnia．Some people say，"I didn't sleep all night．"But that's not really true．They may sleep lightly and wake up several times．In the morning，they only remember the times they were awake（醒着），so they think they were awake all night．
This is not a new problem．Many famous people in history had insomnia．Some of these people had special ideas to make them sleep．Benjamin Franklin had four beds．He moved from one to the other to fall asleep．Mark Twain had a different way．He lay on his side across the end of the bed!

77．If you are thirteen years old，you need at leastC hours of sleep．
A.16
B.12
C.9
D.7
78．What does"insomnia"mean in this passageA？
A．No sleep．
B．Bad sleep．
C．Slow sleep．
D．Sleep with many dreams．
79．Which of the following is true according to the passageB？
A．We will die soon if we don't sleep well．
B．The older we get，the less sleep we need．
C．We can tell a person's age from his sleep time．
D．Famous people move from one bed to the other to fall asleep．
80．Which would be the best title for this passageB？
A．Sleep More!
B．Go to Sleep!
C．Age and Sleep Time
D．Famous People and Sleep．

分析睡眠很重要，我们一生有三分之一的时间是在睡觉，一年大约121天，每个人所需求的睡眠时间不同，美国有些人失眠，他们说睡不着，实际上可能是睡觉轻，醒来很多次，历史上很多名人用一些特别的办法解决失眠．

解答 77．C．细节题，结合第二段Teenagers need 9 to 10 hours of sleep．青少年至少需要9小时睡眠时间，十三岁是青少年，故选C．
78．A．词意猜测题．结合Many of these people can not fall asleep．The name of this problem is insomnia可知人们睡不着，叫做insomnia失眠，故选A．
79．B．细节题，结合第一段We need less sleep as we get older．可知是年龄越大睡眠时间越少，故选B．
80．B．标题判断题，结合Sleep is very important可知本文是说睡眠的重要性，要保证睡眠时间，要去睡觉．故选B．

点评本文浅显易懂，各个小题都能在文中找到适当依据．只要认真阅读短文，注意前后联系，就能顺利完成阅读．文章所设试题主要考察细节查找，做题关键是找出原文的根据，认真核查小题和原文的异同．

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