he is swimming across the river.变否定句、一般疑问句、肯定回答、否定回答急需
题目
he is swimming across the river.变否定句、一般疑问句、肯定回答、否定回答急需
答案
否定句:He isn't swimming across the river.一般疑问句:Is he swimming across the river?-Yes,he is.-No he isn't.
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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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