It is wrong of you to laugh __________ people.
题目
It is wrong of you to laugh __________ people.
A. at others B. in other C. at other D. in another
why?
答案
选c
laugh at是嘲笑的意思
others后面不能接people
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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