I went to a library yesterday
题目
I went to a library yesterday
答案
我昨天去了一个图书馆.
如果变成问句：
Where did you go yesterday?
Did you go to a library yesterday?
When did you go to a library?
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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