题目内容
The Great Wall was built by Qin Shihuang, the first emperor of China to protect the northern territories of China in 221 B.C.
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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。
在观察圆的面积大小变化时,直径与周长都是变量,而圆的周长与直径的比值是一个常量。
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