There were some children in the park just now 变一般疑问句 并做否定回答
题目
There were some children in the park just now 变一般疑问句 并做否定回答
答案
Were there some children in the park just now?
No,there were not
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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