写一段小动物的故事,用英文
题目
写一段小动物的故事,用英文
答案
I have a dog,his name is Joy.He is very lovely like other dogs.When he feels happy,he always wags his tail.When he wants to eat food,he often follows me until I give him something to eat.I really like...
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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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