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众所周知,约170万年前,在云南省元谋县出现了人类,是我国境内已知的最早的人类。当人类学会直立行走时,开始了有别于其他动物的能力:使用并制造工具。地处青衣江流域的雅安,什么时候开始了人类的活动,他们最
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