以如何加强运动锻炼为题的英语作文
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以如何加强运动锻炼为题的英语作文
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Keep healthyas we know ,have a health body is good for ourselves .so,to keep health is very important.How to keep health is a attention problem at present.People always gets ill by mouth,so i think to...
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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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