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gu jin wen ming (1)
Author(s): 
Pages: 53-54
Year: Issue:  6
Journal: History Teaching in Middle Schools

Abstract: <正> 前言如果把我们星球的年岁——目前测定为约五十亿年——浓缩为一年,那前8个月里毫无生命迹象。接下来的两个月,见到的只是植物和极原始的动物形式。进入12月很久以后,哺乳动物才露面。在这"年"中,"直立人"的成员,我们的远古先辈,只是在12月31日夜里的
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