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史前人类与“野人”有什么区别？史前人类又有什么特殊之处呢？
关于人类出现的时间问题，曾经引起过很多人的讨论，甚至，有人说在恐龙出现的时候，人类就已经存在了。但是，更为流行的观点却认为真正意义上的人类，是距今约200万年前出现的.....
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