求一篇名字为My hobby（我的爱好是收集邮票）的英语作文10句话!
题目
求一篇名字为My hobby（我的爱好是收集邮票）的英语作文10句话!
答案
My hobby is collecting stamps.It is very interesting to collect stamps.I have collected them for a long time.Now I have hundreds of stamps from home and abroad.There are all kinds of stamps in the wor...
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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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