有关about volunteer work的英语演讲（急!）
题目
有关about volunteer work的英语演讲（急!）
答案
I wanna talk about a new hobby of mine which is doing volunteer work for local charity.The charity is called the Lamma Animal Protection and it's based on Lamma Island - where I live.And it aims to he...
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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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