8．Up to 65% of children don't get as much sleep as they should do，and this can make them nervous and slower at school，scientists say．
So how long should young people sleep each night？The answer is between eight and ten hours．If you don't get enough sleep at night，you'll have less energy the next day．
But the scientists say many children have missed out on 4，500hours of sleep by the time they are seven years old．They say that children miss sleep because they have TVs and computers in their rooms，and busy parents don't read to their younger children at night any more．The traditional"bedtime story"helps children to relax and fall asleep peacefully．Children with TVs and computers in their bedrooms were more likely to sleep badly，and to get less than eight hours'sleep．Even losing one hour's sleep a night can mean that children do less well at school．
German scientists think that your brain （大腦） keeps working while you are asleep．To show that they were right，they gave two groups of people a problem to work out．One group went to sleep，and the other group stayed awake．The result？The people who slept worked out the answer more quickly．This showed that their brains had been trying to find the answer while the people were asleep．So，make sure you get enough sleep tonight，and you'll be at your best tonight，and you'll be at your best tomorrow!

51．What problem do more than a half of students have？B
A．They don't get on well with their studies．B．They don't  have enough sleep at night．
C．They don't relax themselves at school．D．They don't follow their school rules
52．If you have less energy the next day，you'll probably feelA．
A．sleepy，slow and nervous             B．tired，bored and worried
C．a(chǎn)fraid，alone and angry               D．dull，lazy and crazy
53．According to the third paragraph，what has worst influenced many children's sleep？D
A．Their parents'noise．B．Bedtime stories．
C．Too much homework                  D．TV and computers
54．The German scientists'experiment showed thatC．
A．our study depends on our sleep           B．our sleep helps improve our health
C．our brain works while we sleep           D．our brain works faster during sleep
55．This passage in mainly written forD．
A．parents      B．school teachers      C．scientists     D．young students．

分析 短文講了現(xiàn)在65%以上的孩子缺少睡眠，這會使他們感到困乏，緊張而且反應(yīng)緩慢，并舉例說明造成睡眠不足的原因，建議人們要有充足的睡眠，才能夠做的更好．

解答 答案：51．B  細(xì)節(jié)理解題．根據(jù)第一段句子Up to 65% of children don't get as much sleep as they should do，65%以上的兒童沒有足夠多的睡眠，可知在晚上他們沒有足夠的睡眠．故選B．
52．A  細(xì)節(jié)理解題．根據(jù)第一段句子 this can make them nervous and slower at school，scientists say．科學(xué)家說，這可能導(dǎo)致他們在學(xué)校緊張不安而且反應(yīng)緩慢．可知如果第二天你沒有足夠的精力，你會感覺困，緊張不安而且反應(yīng)緩慢．故選A．
53．D   細(xì)節(jié)理解題．根據(jù)第三段第三行句子Children with TVs and computers in their bedrooms were more likely to sleep badly，and to get less than eight hours'sleep．房間里有電視和電腦的孩子更有可能睡得不好，睡眠少于八個小時．可知電視和電腦影響孩子的睡眠．故選D．
54．C  細(xì)節(jié)理解題．根據(jù)最后一段第一句German scientists think that your brain （大腦） keeps working while you are asleep．德國科學(xué)家認(rèn)為在你睡覺的時候，你的大腦一直工作．可知德國科學(xué)家認(rèn)為在我們睡覺的時候，我們的大腦一直工作．故選C．
55．D   細(xì)節(jié)理解題．根據(jù)整篇文章內(nèi)容及其第一段句子Up to 65% of children don't get as much sleep as they should do，and this can make them nervous and slower at school，scientists say．65%以上的兒童沒有足夠多的睡眠，科學(xué)家說，這可能導(dǎo)致他們在學(xué)校緊張不安而且反應(yīng)緩慢．可知這個短文是寫給學(xué)生的．故選D．

點評 在通讀全文的基礎(chǔ)上，根據(jù)全文大意，展開邏輯思維，瞻前顧后，認(rèn)真觀察選項，仔細(xì)推敲，確定最佳答案．

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