put their feet
题目
put their feet
不是字面的意思！
答案
Read the dialogue and guess the meaning of "put their feet up".You may answer it in English or Chinses. --Which side won? --Germany. England put their feet too early. 呵呵,这个问题是很简单的啦~~ 是IQ...
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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