什么是有用的 英语作文
题目
什么是有用的 英语作文
答案
What is useful
What is useful for us?Money?Fame?Love?or any thing else?People always try to find what is useful to them so they can benefit from it.However,different people have different opinion about what is good and what is bad; it's very hard to decide what's useful to everyone.A rich merchant might has a lot of money,but he might not be as happy as a poor farmer.It's true that the thing that's useful to us are really not the same for everyone.Find the thing that's really useful to you,really what you want,and stick with it; there is no need to regret.
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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