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    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 （大脑） 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．afraid，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 短文讲了现在65%以上的孩子缺少睡眠，这会使他们感到困乏，紧张而且反应缓慢，并举例说明造成睡眠不足的原因，建议人们要有充足的睡眠，才能够做的更好．

    解答 答案：51．B  细节理解题．根据第一段句子Up to 65% of children don't get as much sleep as they should do，65%以上的儿童没有足够多的睡眠，可知在晚上他们没有足够的睡眠．故选B．
    52．A  细节理解题．根据第一段句子 this can make them nervous and slower at school，scientists say．科学家说，这可能导致他们在学校紧张不安而且反应缓慢．可知如果第二天你没有足够的精力，你会感觉困，紧张不安而且反应缓慢．故选A．
    53．D   细节理解题．根据第三段第三行句子Children with TVs and computers in their bedrooms were more likely to sleep badly，and to get less than eight hours'sleep．房间里有电视和电脑的孩子更有可能睡得不好，睡眠少于八个小时．可知电视和电脑影响孩子的睡眠．故选D．
    54．C  细节理解题．根据最后一段第一句German scientists think that your brain （大脑） keeps working while you are asleep．德国科学家认为在你睡觉的时候，你的大脑一直工作．可知德国科学家认为在我们睡觉的时候，我们的大脑一直工作．故选C．
    55．D   细节理解题．根据整篇文章内容及其第一段句子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%以上的儿童没有足够多的睡眠，科学家说，这可能导致他们在学校紧张不安而且反应缓慢．可知这个短文是写给学生的．故选D．

    点评 在通读全文的基础上，根据全文大意，展开逻辑思维，瞻前顾后，认真观察选项，仔细推敲，确定最佳答案．

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