描写假日的英语书面表达!急用
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描写假日的英语书面表达!急用
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快乐的暑假生活-Happy Summer Holidays My summer vacation of this year was very enjoyable. I went to the countryside to spend my summer holidays. It is very beautiful there. There are green plants, clea...
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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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