英语作文what did you do to help your parents before the spring festival?
题目
英语作文what did you do to help your parents before the spring festival?
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答案
what did you do to help your parents befour the spring festival?Spring festival is coming,that's a lot of housework for my mother to do,it's very tiring for her.I want to help her to do the huosework,...
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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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