题目内容
When did the construction of the Imperial Palace begin?
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The Great Wall is called "Wan Li Chang Cheng" because it is a "Ten Thousand-li-long Wall".
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The Great Wall extends from Jiayuguan Pass in Gansu Province in the east, to Shanhaiguan Pass at the Bohai Bay in the west.
Which are two functions of the river channel in the Imperial Palace?
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