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C本文是一篇说明文[文]。文章介绍了走路对[章]于创造力的激发与思[来]维的发散所具有的重[自]大意义。28.D推[知]理判断题。第一段的[嘛]“Here's what Friedrich[答] Nietzsche[案] wrote:‘It[网] is only ideas gained fromwalki[文]ng that have any worth.'Thomas Jefferson[章]:'Walking is the best possible exercise.[来]CharlesDi[自]ckens:“If[知] I could not walk far and fast,.I think I should just explode and die..’”引用[嘛]了一些名人的话，所[答]以可推知作者是通过[案]列举名人名言介绍了[网]主题。故选D。29[文].A词义猜测题。根[章]据第四段讲到了散步[来]带来的好处，所以画[自]线词所在句的含义为[知]：散步对于你获得对[嘛]新问题的新认识是推[答]进剂、是催化剂。选[案]项A.causin[网]g a change(带来[文]改变)，符合题意，[章]故选A。30.C细[来]节理解题。根据第四[自]段最后一句“Bei[知]ng inside,yo[嘛]u're more likely to be lifeless,[答]whichmean[案]s you don't have enough energy to wonder or create.”可[网]知，当你身处室内时[文]，你会没有精力去探[章]索和创造。选项C([来]在室内工作会降低人[自]们的创造力)与文意[知]相符，故选C。31[嘛].D标题归纳题。根[答]据第一段中“Her[案]e's what Friedrich[网] Nietzsche[文] wrote:‘It[章] is only ideas gainedfro[来]m walking that have any worth.'Thomas Jefferson[自]:'Walking is the best possible exercise.[知]'Charles Dickens:‘[嘛]If I could not walk far and fast,I think I should just explode and die.’”可知，[答]作者开篇引用了名人[案]的话来说明散步的好[网]处，进而在下文介绍[文]在大自然中散步的好[章]处。由此可推断，本[来]文主要讲述了走路对[自]于创造力的激发与思[知]维的发散的好处，即[嘛]散步可以带来奇迹。[答]故选D。
15.(10分)已知函数f(x)=|2x一4|+|x+1.(1)解不等式f(x)≤7一x;(2)设f)的最小值为M,正实数a,6c满足a+b=M,证明：生1+，a6+1≥3.(1)解：当x<-1时，f(x)=-2x十4-x-1=-3x十3≤7-x,得-2≤x<-1;当-1≤x≤2时，f(x)=-2x十4+x1=-x+5≤7-x,得-1≤x≤2；当2>2时f(x)=2z-4+x+1=3x-3<7-z,得2
