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【C2】______ .The young may need more sleep than the old, but【C3】______ eight hours are enough for the health of grown-ups. Some can do with less than this amount but【C4】______ may need more. Every person knows his own need. It is then a matter of how to【C5】______ it. Sleep should be always been enough to make one relaxed and ready for【C6】______ work.
    Fresh air is【C7】______ to sound sleep. It is not【C8】______ reason for some people to insist that it is practical to sleep in the open air.【C9】______ a person can keep himself warm, out-of-door sleeping probably gives the body【C10】______ complete relaxation.
    Ability to sleep is largely a habit. The conditions referred to only lead to sleep. Out-of-door 【C11】______, a good habit of regular drinking and the avoidance of late eating and【C12】______  are helpful to sound sleep. Such factors are largely within the【C13】______ of any person. A bath at 【C14】______, neither hot nor cold but of body temperature, may be helpful to sleep. Sleeping pills should never be taken except when suggested by【C15】______.
【C9】

选项 A、As
B、Where
C、Unless
D、When

答案C

解析 语法结构题。本题主要考查状语从句。as意为“正如……”,引导方式状语从句;where意为“在哪里”,引导地点状语从句;unless意为“除非”,引导条件状语从句;when意为“什么时候”,引导时间状语从句。通过分析句子结构可知,out-of-door sleeping的前提条件是keep himself warm,因此应用unless(除非)表示条件。
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