将下列句子改为否定句(速度啊）
题目
将下列句子改为否定句(速度啊）
1.My sister has a green skirt 2.We had a football match yesteeday evening 3.I have a pair of new shoes 4.Tom has a notebook 5.There are new desk in our classroom
答案
1.My sister doesn't have a green skirt 2.We didn't have a football match yesteeday evening3.I don't have a pair of new shoes 4.Tom doesn't have a notebook 5.There aren't new desks in our classroom
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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