（My lovely day on winter holiday）英语作文
题目
（My lovely day on winter holiday）英语作文
答案
I really had a busy and happy winter holiday. I do my homework, and my help your parents do some housework, every day.i love sports and surfing the internet. i also enjoy playing computer games… Duri...
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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