英语作文 my favorite famous singer
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你能帮帮他们吗
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The number of books in the bookshop ________ (be) about 10,000 and most of them are about science.
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I have told you the truth. ___________ I keep repeating it?
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变形虫的( )将细胞与外部环境分开,既有保护作用又能进行物质交换.
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经济学中有著名的Cobb-Douglass效用函数为u(x1, x2)=x1a*x2b(a大0,b大0),设某人的收入y
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would you like to sweep the floor?同义句
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