My Good friend英语作文40词的实在谢谢了
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My Good friend英语作文40词的实在谢谢了
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My Good Friend My good friend is ChaiRong.She is my classmate.She is tall and thin.She has two big eyes and long hair.She is nice.We all like her.She is a model student.She’s clever and she’s helpfu...
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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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