Our hobbies的作文.
题目
Our hobbies的作文.
答案
Our HobbiesMy friends have got many hobbies.Collecting dolls is Yanzi's hobby.She has got lots of beautiful dolls.One is from Shanghai and two are from Beijing.This is from Chengdu and these are from ...
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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