I want hiking with a few of my friends last summer it was a good trip in the beginning but somet...
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I want hiking with a few of my friends last summer it was a good trip in the beginning but somet...
I want hiking with a few of my friends last summer it was a good trip in the beginning but something unexpecting happened half way one of my friend suddenly felt a terrible pain in his stomach and he couldnt move any far nobody knew what to do it
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I want（went） hiking with a few of my friends last summer.it was a good trip in the beginning,but something unexpecting(unexpected) happened half way .One of my friend(friends) suddenly felt a terrib...
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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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