They are talking about their hoildays.The girl is doing her homework in the library.
题目
They are talking about their hoildays.The girl is doing her homework in the library.
Mr.Black comes from France.
Gao Shan speaks French very well.
There is a football under the table.
怎么变反问句
答案
They are talking about their hoildays,aren't they?
The girl is doing her homework in the library,is she?
Mr.Black comes from France,doesn't he?
Gao Shan speaks French very well,doesn't she?
There is a football under the table,isn't there?
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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