适合小学六年级男生一分钟英语开头文章
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适合小学六年级男生一分钟英语开头文章
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Hi,my name is ...I am 12 years old.I like blue best.Potatoes and beef are my favourite food.Because they are tasty and healthy.I like winter best.Because I can play with snow and make a snowman in win...
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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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