英语作文（外貌描写）100字左右
题目
英语作文（外貌描写）100字左右
答案
My ClassmateLiu Dong is my classmate.He is from Shanghai.He is a boy.He is 15 years old.He is tall and thin.He has two big eyes and one small nose.He has two big ears.His mouth is big and has long bla...
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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