暑期英语日记5篇,要新的.谢谢啦!
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暑期英语日记5篇,要新的.谢谢啦!
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August 13 2008 Yesterday we played happily,but there were only ten people.I remembered last year there were twenty-two people at all.I heard some my friends had gone abroad.They went abroad to study.M...
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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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