英语作文 a good film
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英语作文 a good film
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finished watching the old film Titantic----the love story between Rose and Jack.It is a really good movie,and I can not help spending three hours watching it although I am so tired and sleepy.What is ...
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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