求一篇英语演讲作文what we cannot affort to lose
题目
求一篇英语演讲作文what we cannot affort to lose
答案
What We Cannot Afford to Lose We youths often ask each other what we cannot afford to lose, which I often think over. Here is my answer. First, we can't afford to lose our youth. Youth is a ti...
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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