Waving hands and ( )are common greeting manners all over the world. Upon entering college, we have begun a new ( )

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Waving hands and ( )are common greeting manners all over the world. Upon entering college, we have begun a new ( ) in which everyone is on the same starting line. A:nodding B: smile C:kiss D:hug 答案: nodding A:competition B:procedure C:story D:experience 答案: competition