Why were you and your friend laughing behind my back when we were walking together the other day?
题目
Why were you and your friend laughing behind my back when we were walking together the other day?
答案
那天当我们在一起走时,你和你的朋友为什么在我背后笑我们?
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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