初中英语作文80词 My pen pal
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初中英语作文80词 My pen pal
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My pen pal I have a lovely pen pal.Her name is Mary.She is 15 years old.She is older than my.She is in Class One,Grade Nine.And her birthday is June first.It is our Children's Day.Her mother is a Japa...
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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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