如This is his pen.要照样写：your TVs肯定句
题目
如This is his pen.要照样写：your TVs肯定句
This pen is his.their toys疑问句
our theachers否定句
答案
Those TVs are yours.
Are those toys yours?
Those teachers aren't ours.
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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