what is it thatwe have in December but that we do not have in any other month
题目
what is it thatwe have in December but that we do not have in any other month
答案
Christmas
只有十二月有,其他时间没有的是什么?
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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