写一篇关于手机的英语作文
题目
写一篇关于手机的英语作文
答案
Nowadays, cellphones become popular among students. There is an heated disscussion on whether students should hold cellphones with them at school. Some students think that it is convenient for stud...
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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