4篇英语作文 70到80词关于寒假假期生活的
题目
4篇英语作文 70到80词关于寒假假期生活的
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1）Today,I feel stair very dirty,I want to do good deeds.I said to her mother,"I want to clean sweep on the first floor,has been stair." Mother agreed.So I took the broom began to clean the stair,from...
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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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