英语作文：假如你叫李华,你的笔友Tom来信说他成绩不好,他很沮丧,并且你要回一封
题目
英语作文：假如你叫李华,你的笔友Tom来信说他成绩不好,他很沮丧,并且你要回一封
答案
Dear Tom:
I'm sorry to hear that.But i think you can have a good grades if you study hard.So you should do more practice about math and history.Don't play computer games on weekdays and study late if you don't feeling very tired.Be happy please,you can do it by yourself.Please write to me soon.
Yous,
Li Hua
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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