When people have mre money than they need for oedinary things,they.
题目
When people have mre money than they need for oedinary things,they.
求原文
答案
When people have more money than they need for ordinary (平常的) things,theysometimes spend their spare money in travelling and seeing other parts of the world.European(欧洲的) people go to the East a...
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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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