gmat考试og阅读复习资料（含答案与解释）

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1、说明1、各题答案和解释均隐藏在每篇文章后面，显示的方法是鼠标左键单击“常用”工具栏“显示/隐藏编辑标记”按钮。再次单击又被隐藏。2．文章按新老观点对比，问题解决，结论解释，现象解释，特殊套路（人名+书名)分类排序。3．此版本是在og阅读隐藏版的基础上编辑而成，谢谢前辈的贡献。4．文中的排列等错误望大家指正。最后，愿大家考试顺利，实现自己的梦想新老观点对比Passage12Passage36Passage49Passage511Passage613Passage1632Passage1938Passage2141Passage2243Passage2345Passage2649P

2、assage2955Passage3262Passage3567Passage3974Passage4177Passage4683Passage4784问题解决Passage24Passage511Passage920Passage1530Passage2446Passage3057Passage4380结论解释Passage1836Passage2548Passage3364Passage3670Passage3872Passage4076Passage4278Passage4582Passage4886现象解释Passage511Passage715Passage817Pa

3、ssage1225Passage1428Passage1734Passage2345Passage2751Passage3159Passage3466Passage3771Passage4076Passage4177Passage4380Passage4481特殊套路（人名+书名)Passage1327Passage2853Passage1Caffeine,thestimulantincoffee,hasbeencalled“themostwidelyusedpsychoactivesubstanceonEarth.”Synder,DalyandBrunshaverecentl

4、yproposedthatcaffeineaffectsbehaviorbycounteringtheactivityin(5)thehumanbrainofanaturallyoccurringchemicalcalledadenosine.Adenosinenormallydepressesneuronfiringinmanyareasofthebrain.Itapparentlydoesthisbyinhibitingthereleaseofneurotransmitters,chemicalsthatcarrynerveimpulsesfromoneneurontoth

5、enext.(10)Likemanyotheragentsthataffectneuronfiring,adenosinemustfirstbindtospecificreceptorsonneuronalmembranes.Thereareatleasttwoclassesofthesereceptors,whichhavebeendesignatedA1andA2.Snyderetalproposethatcaffeine,whichisstruc-(15)turallysimilartoadenosine,isabletobindtobothtypesofreceptor

6、s,whichpreventsadenosinefromattachingthereandallowstheneuronstofiremorereadilythantheyotherwisewould.Formanyyears,caffeine’seffectshavebeenattri-(20)butedtoitsinhibitionoftheproductionofphosphodi-esterase,anenzymethatbreaksdownthechemicalcalledcyclicAMP.Anumberofneurotransmittersexerttheiref

7、fectsbyfirstincreasingcyclicAMPconcentra-tionsintargetneurons.Therefore,prolongedperiodsat(25)theelevatedconcentrations,asmightbebroughtaboutbyaphosphodiesteraseinhibitor,couldleadtoagreateramountofneuronfiringand,consequently,tobehav-ioralstimulat