单数句变复数句,复数句变单数句1He is his friend.2Those are boxes.3 These are desks.
题目
单数句变复数句,复数句变单数句1He is his friend.2Those are boxes.3 These are desks.
答案
1He is his friend.They are their friends.
2Those are boxes.That is a box.
3 These are desks.This is a desk.
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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