character: Lucy
topic: The Great Wall's Impact on Trade and Defense
grade: 4
subject: Social Studies
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character: Marco Polo
topic: Exploration along the Silk Road
grade: 4
subject: Social Studies
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character: Emperor Qin
topic: The construction of the Great Wall
grade: 4
subject: Social Studies
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character: Zheng He
topic: Trade routes during the Ming Dynasty
grade: 4
subject: Social Studies
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