There are four windows in our classroom.（改为否定句） There is a girl under the tree. 改为一般疑问
题目
There are four windows in our classroom.（改为否定句） There is a girl under the tree. 改为一般疑问
Jane and Lily are （in the hall）.（对括号提问）
There are （four hundred） books in the reading room.（对括号提问）
答案
1、There aren't four windows in our classroom.2、Is there a girl under the tree?3、Where are Jane and Lily ?4、How many books are there in the reading room?
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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