Years ago,I lived in a building in a large city.
题目
Years ago,I lived in a building in a large city.
Years ago,I lived in a building in a large city.The building next door was only a few feet alway from mine.
答案
多年以前,我住在大城市里,附近的建筑离我只有一步之遥.
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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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