请根据要求改句子
题目
请根据要求改句子
He is my student (改否定和一般疑问句)
They are my friends (改否定句和一般疑问句)
That is a watch (否定和疑问和特殊疑问句)
答案
He is not my student.Is he your student?
They are not my friends.Are they your friends?
That is not a watch.What is that?
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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