题目内容：
五四运动爆发的导火线是（ ） 。
参考答案：
答案解析：
单选题：五四运动爆发的导火线是（ ） 。
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Greg is an acknowledgeable expert of handling money exchange
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From these examples of adverts, we can conclude that（ ）
From these examples of adverts, we can conclude that（ ）