题目内容
___ is a system of timekeeping that defines the beginning and length and divisions of the year.
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___ lines will never meet no matter howfar extended.
If something has ___, it consists of things which are different from each other.
-When is the MidAutumn Festival held?it is held on the ___ day of the eighth month in the Chinese calendar.
What is the traditional food of this festival?
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