why something is so popular in the world?与 why is something so popular in the world?的区别?
题目
why something is so popular in the world?与 why is something so popular in the world?的区别?
答案
why something is so popular in the world?
为什么在世界上有些东西是如此受欢迎?
why is something so popular in the world?
为什么在世界上是如此的受欢迎?
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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