2. 外语
  3. Enough sleep is important to health. The amount of sleep【C1】_______depends on the age of the person and the conditions in which

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【C4】_______of grown-ups. Some can 【C5】_______with less than this amount but【C6】_______may need more. Every person knows his own【C7】_______. It is then a matter of how to【C8】_______it. Sleep should always be【C9】_______to make one relaxed and ready for【C10】_______work.
    Fresh air is【C11】_______to sound sleep. It is not【C12】_______reason for some people to【C13】_______that it is practical to sleep in the open air. 【C14】_______a person can keep himself warm, 【C15】_______sleeping probably gives the body【C16】_______complete relaxation.
    Ability to sleep is largely a【C17】_______. Out-of-door【C18】_______, a good habit of regular 【C19】_______, the avoidance (避免) of late eating, and【C20】_______are all helpful to sound sleep.
【C9】
选项 A、deep
B、enough
C、short
D、long
答案B
解析 enough足够的。因为前文一直在说睡眠足够的问题。
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