新概念英语第二册第51课摘要写作
题目
新概念英语第二册第51课摘要写作
答案
Lesson 51 Reward for virtue
Hugh is so fat that he has gone on a diet.He has forbidden himself all the foods he likes but he has not lost weight.When the writer visited him yesterday,he hid a large parcel under his desk.The parcel contained chocolates and sweets.Hugh said that he had to reward himself occasionally because his diet was so strict.
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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