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  3. If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry

If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry

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问题     If you are worried about things and are under a lot of stress at work or school, then you are probably not sleeping well. Worry can keep you awake,【C1】______over and over in bed until the early hours of the morning when you eventually【C2】______asleep. When you wake up, you don ’ t feel【C3】______, but tired and worn out and【C4】______to face a new day.
    Dr. Henry Winkle, in a recent newspaper article【C5】______Stress and Sleep,【C6】______that stress and lack of sleep are directly【C7】______Dr. Winkle says, "The more we worry, the【C8】______we sleep, the more we are unable to deal with【C9】______. " " If we can find a way to get a good night’ s sleep," he【C10】______, "we can often find the【C11】______to deal with what’ s worrying us. "
    So, what is a good night’ s sleep? Research shows that the amount of sleep which people need in order to keep healthy【C12】______a lot. Seven hours is about the average amount,【C13】______strangely enough, sleeping longer often gives you a headache【C14】______of making you feel more refreshed.
    Dr. Winkle believes that preparing for sleeping is important. People who work late should try to give themselves a short【C15】______and do something restful before going to bed. This could be watching TV or listening to music. Doing some exercise【C16】______in the day should help you to feel physically as well as【C17】______tired. A bedtime drink can also help, but coffee or tea should be avoided as they contain caffeine and will keep you【C18】______. " When you turn the light【C19】______," Dr. Winkle says, " concentrate on relaxing your muscles, slowly up from your feet, and you’ 11 be asleep【C20】______you know it. "
【C12】
选项 A、varies
B、changes
C、alters
D、contrasts
答案A
解析 由句意可知，为了保持健康，人们需要的睡眠总量差异很大。vary：(大小、形状、数量等)不同；change：变化，变成；alter：改变，更改；contrast：对比。故选A。
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