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  3. Enough sleep is important to health. The amount of sleep【21】depends on the age of the per son and the conditions in which sleep【

Enough sleep is important to health. The amount of sleep【21】depends on the age of the per son and the conditions in which sleep【

admin2012-01-31  28
问题     Enough sleep is important to health. The amount of sleep【21】depends on the age of the per son and the conditions in which sleep【22】. The young may need more sleep than the old, but【23】eight hours are enough for the health of grown-ups. Some can do with less than this amount but【24】may need more. Every person knows his own need. It is then a matter of how to【25】it. Sleep should be always enough to make one relaxed (松弛) and ready for【26】work.
    Fresh air is【27】to sound sleep (酣睡). It is not【28】reason for some people to insist that it is practical to sleep in the open air.【29】a person can keep himself warm, out-of-door sleeping probably gives the body【30】complete relaxation.
    Ability to sleep is largely a habit. The conditions referred to only lead to sleep. Out-of-door【31】, a good habit of regular drinking and the avoidance of late eating and【32】are all helpful to sound sleep. Such factors are largely within the【33】of any person. A bath at【34】, neither hot nor cold but of body temperature, may be helpful to sleep. Sleeping pills should never be taken except when suggested by【35】.
选项 A、As
B、Where
C、Unless
D、When
答案D
解析 此题应是when引导的时间状语，句意为：“如果能保持暖和，在户外睡觉可使身体彻底放松。”
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