征：英语作文一篇：怎样做一名导游员?
题目
征：英语作文一篇：怎样做一名导游员?
答案
How to be a good guide The guide is the representative of a travel service and is often the only one that tour members will meet. In my view, the way to be a qualified guide is the professional...
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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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