以My best present为题写一篇英语作文
题目
以My best present为题写一篇英语作文
答案
My best presentMy best present is my pet dog,Sam.My fanther gave it to me when I was nine years old.It has big eyes and strong feet.It is very lovely.I often play with Sam after school.Sam is always f...
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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