单选题:The best time of the day to read stories to a child is

题目内容:
The best time of the day to read stories to a child is A.when the child is still active in the early evening
B.when the parents finish the day's housework
C.when the child has chew toy to play with
D.when the child is quiet and peaceful

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答案解析:

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正四棱锥P-ABCD的所有棱长都相等,E为PC的中点,那么异面直线BE与PA所成角的余弦值等于__________.

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第37题应填__________A.leave B.visit C.stay D.travel

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