Does he have lunch at home?改为肯定句
题目
Does he have lunch at home?改为肯定句
He is short（用tal|改为选择疑问句
答案
Does he have lunch at home?肯定句为He (often)has luch at home.
He is short.tall的选择疑问句为Is he tall or short?
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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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