why pairs is called the City of Lights?(请用英文回答,
题目
why pairs is called the City of Lights?(请用英文回答,
答案
there are 2 mistakes in ur qiestion. Paris,----not pairs.light---not lights.the following answer taken from viki may help you:Paris was nicknamed the "City of Light" (not City of Lights) originall...
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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