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On May 12, 2008, an earthquake measuring 7.8 on the Richter scale oc
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来新夏
Chronology, a relatively special genre of biography in historical bo
李知宴
As early as the Neolithic Age, our ancestors invented pottery, and t
郭书春
Mathematics is one of the most developed basic scientific discipline
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China is one of the origin centers of world agriculture.Chinese agri
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"Prehistoric" specifically refers to the entire human hist
郭彦岗
China is one of the first countries in the world to use currency. Si