英语作文a letter to my pen friend(60字左右)
题目
英语作文a letter to my pen friend(60字左右)
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Dear pen friendI miss you very much.I'v heard that you would come to my hometown next week.And I will meet you at the city airport.When you come to the airport,please call me as soon as possible.I wil...
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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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