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  Howmuchsleepisenough?  Tostayingoodhealth,someexperti...
問題詳情:  Howmuchsleepisenough?  Tostayingoodhealth,someexpertintheUSsay,adultsshouldgetseventoeighthoursofsleep.Teenagerneedninetotenhours.Andpre-schoolchildrenneedmorethan10hoursofsleepanight. ...
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