He has to do his homework first.改为一般疑问句.The weather is nice today,——?反意疑问句.
题目
He has to do his homework first.改为一般疑问句.The weather is nice today,——?反意疑问句.
Mary visits her parents once a month.对once a month提问.
答案
Does he have to do his homework first?
The weather is nice today,isn't it?
How often does Mary visit her parents?
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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