问 be on vacation go on vacation do for vacation take a vacation go for vacation等有什么区别,
题目
问 be on vacation go on vacation do for vacation take a vacation go for vacation等有什么区别,
顺便问：What are you doing for vacation？与What are you doing on vacation？有何区别？
答案
be on vacation是正在度假 go on vacation/take a vacation/go for vacation都是去度假 可以混用其中go for vacation 较随意可通过“go for a walk去随便走走”来理解 do for vacation为度假做准备 引申为去度假
What are you doing for vacation?是在为度假做什么准备
What are you doing on vacation?是在度假时做了什么
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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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