急需一篇英语作文 what would you do if an old man fell down
题目
急需一篇英语作文 what would you do if an old man fell down
答案
A reporter did a survey about "what would you do if an old man fell down?" among 200 students,here are the results.100 students said that they would help the old man get up right away,because that is ...
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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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