Millions of people around the world have some type of phsical,mental ,or emotional
题目
Millions of people around the world have some type of phsical,mental ,or emotional
Millions of people around the world have some type of phsical,mental ,or emotional hadicap that severely limits their abilities to manage their daily activities.
其中,some type 后面为什么用单数?为什么不用types?
答案
这里的some是“某种”的意思,不是“一些”.
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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