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    Do you get enough sleep? With so much homework it's often difficult to get the rest you need. But you need to try， because sleep keeps you healthy and it stops you getting fat.
    Recently， a group of US scientists did a study (调查) of kids aged between 8 and 13. The study found that if kids sleep for just one extra (额外的) hour each day, the chance of their getting fat is cut by about 30 percent .
    Why? When people don't get enough sleep, they become tired. When they are tired, they don't exercise enough. Also， kids like snacks: If they are awake (醒着的) an extra hour or two each day，they have more time to eat snacks or other unhealthy foods.
    So， how much sleep should you get? Scientists suggest 10 to 11 hours a night for kids aged 5 to 12. For older kids, eight to nine hours will do.
    小题1:How many reasons are given why people might get fat without enough sleep?
    A．3. B．2. C．1 D．None.
    小题2:If you are under 10， how long do the scientists advice you to sleep?
    A．10 to 11 hours. B．8 to 9 hours. C．8 to 13 hours.D．As long as possible.
    小题3:Where was the study done by the scientists?
    A. In China.        B In Britain.        C. In America.        D. In Japan.
    小题4:What does" eight to nine hours will do" mean?
    A. Eight to nine hours' sleep will be good and enough.      
    B Eight to nine hours' sleep will be too long.
    C. Eight to nine hours' sleep will help get fat.
    D. Eight to nine hours' sleep will help eat snacks and unhealthy foods.
    小题5:What does the passage talk about?
    A. How to get long sleep. 
    B How to keep fat.
    C. Enough sleep makes people healthy and slim (苗条)   
    D. Long sleep makes people healthy and slim.

    小题1:B
    小题2:A
    小题3:C
    小题4:A
    小题5:C

    试题分析：这篇文章主要讲述了充足的睡眠会使人健康和苗条。美国调查发现睡眠不足会使人发胖并说明了原因，文章还告诉我们孩子的睡眠时长。
    小题1:细节理解题。根据文章第三段可知没有充足的睡眠会使人发胖有两个原因：1）没有充足的睡眠人们就会累锻炼就少，就容易发胖；2)孩子醒着的时间多，他们吃零食和不健康食品的机会就多，就容易发胖。故选B。
    小题2:细节理解题。根据最后一段Scientists suggest 10 to 11 hours a night for kids aged 5 to 12.可知科学家建议5到12岁的孩子每晚休息10到11个小时，故选A。
    小题3:细节理解题。根据第二段第一行a group of US scientists did a study (调查) of kids aged between 8 and 13.可知是美国的科学家做的调查，故选C In America.在美国。
    小题4:细节理解题。结合上句Scientists suggest 10 to 11 hours a night for kids aged 5 to 12.可知科学家建议5到12岁的孩子每晚休息10到11个小时，那么eight to nine hours will do.意思就是8到9个小时的睡眠就是好的和足够的，故选A。
    小题5:主旨大意题。结合全文可知文章主要谈论了充足的睡眠会使人健康和苗条，故选C。
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