What are you doing here,Mary and Kate?We are looking at_____pictures.
题目
What are you doing here,Mary and Kate?We are looking at_____pictures.
A.each's other B.each other's C.each other D.each's other's
答案
B.固定用法,背下来就行了
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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