警察抓小偷英语作文
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警察抓小偷英语作文
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Last Sunday,Amy went to a shopping mall.She wanted to buy a pair of shoes.Suddenly she saw a short man behind her.He stole her purse and ran out of the shop.Amy shouted "Stop thief!Stop thief"A police...
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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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