写一篇my happiest day的英语作文
题目
写一篇my happiest day的英语作文
答案
Yesterday I made out with my best friend.That was really my happiest day ever.He was very impressive,and even went for several rounds on end.It was kind of painful during the process.But it was worth ...
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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