英语短文：a letter to a penfriend
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英语短文：a letter to a penfriend
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No.28 Middle SchoolYangzhouApril 8,2009Dear Mr President Bush,I am a student from China.All my classmates and I are caring about the war between your country and Iraq.So far,the war has lasted about t...
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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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