英语作文：My friend 怎么写?
题目
英语作文：My friend 怎么写?
答案
My FriendMy best friend is a girl.She is very smart and beautiful.She likes singing,dancing and shopping.She always enjoy themself with her friends.She also is very warmhearted and polite.She is good ...
举一反三
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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