谁能写一篇描写一个外星人外貌特征的80字作文
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谁能写一篇描写一个外星人外貌特征的80字作文
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I had a wonderful dream last night!I dreamed about the ET!It was scaried me,because that was my first time to dream about the ET.I saw they have 3 bigs looking at me.I think their don't have any cells...
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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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