They are swimming in the tiver 变成否定句,一般疑问句,对swimming提问
题目
They are swimming in the tiver 变成否定句,一般疑问句,对swimming提问
答案
否定 They aren't swimming in the river.
一般 Are they swimming in the river?
提问 What are they doin in the river?
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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