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当前学科：中国通史
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“六合之内，皇帝之土；乃今皇帝，一家天下。”这则纪功石刻说的是（）
A . 秦始皇统一六国
B . 秦始皇统一文字
C . 元世祖巩固和发展统一多民族国家
D . 元世祖奠定了今天中国行政区域划分的基础
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