急求牛津初中英语9a的课文原文!
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急求牛津初中英语9a的课文原文!
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unit1Star signsA year is divided into 12 different star signs.Your date of birth decides your star sign.Some people believe that people born under the same star sign share similar characterstics.21st ...
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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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