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  3. Enough sleep is important to health. The amount of sleep needed depends on the age of the person and the conditions【C1】______ sl

Enough sleep is important to health. The amount of sleep needed depends on the age of the person and the conditions【C1】______ sl

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问题     Enough sleep is important to health. The amount of sleep needed depends on the age of the person and the conditions【C1】______ sleep takes place. The young may need more sleep than the old, 【C2】______ generally eight hours is enough for the health of grown-ups. 【C3】______ can do with less than this amount but children may need more. Every person knows his own need. It is then a matter of【C4】______ to satisfy it. Sleep should be always enough to make one relaxed and ready for a day’s work.
    Fresh air is necessary to sound sleep. It is not【C5】______ reason for some people to insist that it is practical to sleep in the open air.【C6】______ a person can keep himself warm, out-of-door sleeping probably gives the body a most complete relaxation.
    Ability to sleep is largely a habit. The conditions【C7】______ to only lead to sleep. Out-of-door exercises, a good habit of regular drinking and the avoidance of late eating and worry 【C8】______ all helpful to sound sleep. Such factors are largely【C9】______  the control of any person. A bath at bed time, neither hot nor cold but of body temperature, may be helpful to sleep. Sleeping pills should never be taken except when【C10】______  by a doctor.
选项 A、are
B、is
C、were
D、was
答案A
解析 主语为复数且文中主体时态为一般现在时，故此处用are。
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