初一英语下册短语unit7
题目
初一英语下册短语unit7
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Johnny Dean's New Look!Do you remember Johnny Dean,the pop singer with funny glasses and long curly hair?Well,now he has a new look.He doesn't have long curly hair.He has short straight hair.And he do...
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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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