the impact of cell phone on my life
题目
the impact of cell phone on my life
impact of cell phone on my life!
答案
Cell phones have become increasingly popular in China these days.Wherever you go you can see people using cell phones.Many college students,even high school students,have cell phones.Cell phones have ...
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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