What topic is the passage mainly concerned with? [br] What are the two mysteries

游客2023-09-16 27

问题 What topic is the passage mainly concerned with? [br] What are the two mysteries that have remained unknown to the modern people?

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答案 When man began to use fire and language．

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Ihavefoundsomearticles_____theharmfuleffectsofdrinking.A、beingconcerned