The boy who is running won the first prize.The boy who won the first prize is my son
题目
The boy who is running won the first prize.The boy who won the first prize is my son
答案
第一句中的is改为was
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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