过去式英语作文,写周末,加翻译
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过去式英语作文,写周末,加翻译
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你是六年级的吧 I had a happy weekend last week. On Saturday morning, I watched TV and helped my mother wash clothes. In the afternoon, I cleaned three bedrooms in my house-- mine, my parents' ...
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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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