题目内容
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 was built by Qin Shihuang, the first emperor of China to protect the northern territories of China in 221 B.C.
It extends from Jiayuguan Pass in Gansu Province in the east, to Shanhaiguan Pass at the Bohai Bay in the west.
The Great Wall is wide enough for two cars to drive. Tourists may travel along the Great Wall if they like.
在17世纪,（）把变量引入数学,从而使运动进入数学、辩证法进入数学,在此基础上才创立了微积分。
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