求一篇英语作文,第一次见到陌生人,尽量用点高级词汇!
题目
求一篇英语作文,第一次见到陌生人,尽量用点高级词汇!
答案
One day, I spotted an old man in the street. He was in his sixties, carrying a big plastic bag with a couple of bottles in it. Therefore, i walked up to him without hesitation, and i spoke to him pol...
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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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