句型转换,变为否定句
题目
句型转换,变为否定句
Her parents are Chinese teachers.
There is some coffee in the cup.
There are some trees behined my house.
I have some red coats.
The boy can sing English songs.
These are my books.
Her father is a factory worker.
答案
Her parents aren't Chinese teachers.There isn't some coffee in the cup.There aren't some trees behined my house.I havn't some red coats.The boy can't sing English songs.These aren't my books.Her fathe...
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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