九年级英语上册第四单元reading原文
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九年级英语上册第四单元reading原文
原文有翻译一起给最好
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What would you do if...?Martin Robinson is a famous doctor who has a lot of experience dealing with teenagers.His new book, What Would You Do If…? came out last month. It gives advice onwhat to do in...
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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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