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Olympicsis thebiggestsports_______in theworld.

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Iwas sad becauseIfelt thatthesplendidyears ofmy________childhoodhad come toan end.

The conferencemightreconvene (重新召开)after its opening ________ .

The government has promised a/an _______ ￡1 billion for health care.

反射镜一般由的薄钢板冲压而成或由玻璃、塑料制成，其厚度通常为（）？

A. 0.6～0.8mm
B. 1～2mm
C. 3～4mm