英语作文How to spend a perfect holiday?
题目
英语作文How to spend a perfect holiday?
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summer holiday is a time when every students have an active mind.i remember ,that as a child,i would go out on a outing with classmates once the holiday started,to be close to the nature and enjoy eve...
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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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