According to some doctors,one of the ways to delay the aging process is to make sure that our brains
题目
According to some doctors,one of the ways to delay the aging process is to make sure that our brains get enough exercise
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答案
一些医生的观点认为:有一种延缓人类老化的方法是让我们大脑得到充分的活动(思考).
举一反三
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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