If you could go back in time,which era would you like to go back to?
题目
If you could go back in time,which era would you like to go back to?
答案
如果时光可以倒流,你想回到哪个时代?
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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