pen pal wanted
题目
pen pal wanted
想做笔友的发消息
only practice english
e-mail
答案
I could be your pen pal.
But i think you could not find a good pen pal in China,discover a foreigner to improve your English is better.I have lots of pen pal on board.That must advance your English level.You could add me to your friend list.
Some Teen newspaper also have lots of person's e-mail address.You may have a try.
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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