As many people hit middle age,they often start to notice that their memory and mental clarity are not what they used to be.We suddenly can’t remember___1___we put the keys just a moment ago,or an old acquaintance’s name,or the name of an old band we used to love.As the brain___2___,we refer to these occurrences as“senior moments.”___3___seemingly innocent,this loss of mental focus can potentially have a（n）___4___impact on our professional,social,and personal___5___.Neuroscientists,experts who study the nervous system,are increasingly showing that there’s actually a lot that can be done.It___6___out that the brain needs exercise in much the same way our muscles do,and the right mental___7___can significantly improve our basic cognitive___8___.Thinking is essentially a___9___of making connections in the brain.To a certain extent,our ability to___10___in making the connections that drive intelligence is inherited.___11___,because these connections are made through effort and practice,scientists believe that intelligence can expand and fluctuate___12___mental effort.Now,a new Web-based company has taken it a step___13___and developed the first“brain training program”designed to actually help people improve and regain their mental___14___.The Web-based program___15___you to systematically improve your memory and attention skills.The program keeps___16___of your progress and provides detailed feedback___17___your performance and improvement.Most importantly,it___18___modifies and enhances the games you play to___19___on the strengths you are developing—much like a（n）___20___exercise routine requires you to increase resistance and vary your muscle use.（9）选？
上下文语义衔接+名词辨析本句句意为“思考本质上是大脑进行各个神经元链接的_____。”首先，空格处需要一名词，做表语，而且被of making connections修饰。其次，文中下一句是对这种making connections的阐释和分析，因此只有process（过程）符合句意，故B为正确答案。选项A channel侧重于指某种渠道，原文并没有提及。选项C sequence指的是次序，指一系列的东西按照序列进行排列，原文中并没有强调神经元连接的次序问题。选项D condition指的是条件、状况，文中没有指出思考是构建连接的条件或者状况。因此可排除ACD。
