七年级下册英语75面3a文章（英语书忘带回家了）谢
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七年级下册英语75面3a文章（英语书忘带回家了）谢
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Dear Dr Know,I'm not happy.I have to get up at six o'clock every morning.I can't meet my friends after school because I have to do my homework.I can't watch TV on school nights.And I have to clean my ...
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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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