This is my good friend.变一般疑问句
题目
This is my good friend.变一般疑问句
She dons/t stay up very late.变肯定句.
Lucy goes to the cinema in the evening.变否定句.
He gets up at 6.00 in the morning.变一般疑问句.
答案
第一题：Is this your good friend?
第二题：She stays up wery late.
第三题：Lucy doesn't go to the cinema in the evening.
第四题：Does he get up at 6.00 in the morning?
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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