That a man can never be too old to learn is certainly right的主语是什么～

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• That a man can never be too old to learn is certainly right的主语是什么～
• 已知a>0,设函数f(x)=2012^(x+1 )+2010 / 2012^x+1 （x∈[-a,a]）的最大值为M,最小值为N,那么M+N=?
• One is never too old to learn.