my family的英语作文(要简短的)
题目
my family的英语作文(要简短的)
答案
There are three people in my family .There are my father ,my mother and I.My father is tall and strong .He likes playing sports.My mother is very pretty.She has a long black hair.She likes reading boo...
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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