This is my pencil case.改为一般疑问句
题目
This is my pencil case.改为一般疑问句
Is that her book?做肯定回答
That is her jacket.改为否定句
Is it her key?改为肯定句
This is a pencil in English.对划线句子提问 划线地方是a pencil
答案
Is this your pencil case?
Yes,it is.
That isn't her jacket.
It is her key.
What is this in English?
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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