按要求改写句子.I bought some flowers for my mother yesterday.(改为否定句,一般疑问句及肯否定回答.
题目
按要求改写句子.I bought some flowers for my mother yesterday.(改为否定句,一般疑问句及肯否定回答.
答案
I didn't buy any flowers for my mother yesterday.
did you buy any flowers for your mother yesterday?
yes,i did/no,i didn't
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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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