改错 Who are they?They are doctors.Helen didn’t take some photos at the Sports Day on Friday.
题目
改错 Who are they?They are doctors.Helen didn’t take some photos at the Sports Day on Friday.
答案
Helen didn't take any photos at the Sports Meeting on Friday.
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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