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

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问题     Enough sleep is important to health. The amount of sleep【C1】______ depends on the age of the person and the conditions in which sleep takes place.      The young may need more sleep than the old, but【C2】______ eight hours are enough for the health of grown - ups. Some can do with less than this amount, but【C3】______ may need more. Every person knows his own need. It is then a matter of how to satisfy it. Sleep should be always enough to make one relaxed and ready for【C4】______ 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【C7】______ complete relaxation.
    Ability to sleep is largely a babit. The conditions referred to only lead to sleep. Out - of - door exercises, a good habit of regular drinking and the avoidance of late eating and【C8】______ are all helpful to sound sleep. Such factores are largely within the control of any person. A bath at【C9】______, neither hot nor cold but of body temperature, may be helpful to sleep. Sleeping pills should never be taken except when suggested by【C10】______.
【C6】

选项 A、As
B、Where
C、Unless
D、When

答案D

解析 根据语义,选择“when”,表示“当……时候”。当人能够保证自己的身体温暖时,所以选D。
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