【雷哥gmat】gmat文章层次划分方法

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1、www.gmatonline.cnGMAT文章层次划分方法之前说过支撑一篇文章的框架主要可以根据文章每段首句和每段段内转折词来找。那么在找到框架之后又该怎么去划分框架下得细节内容？划分这些细节对于细节题的做题非常有帮助。原则上我们主要根据具体情况下的句意来划分结构下的层次。比如有这么一段话：一、浙江有很多地方的人组成。绍兴人温州人宁波人那么就可以根据这三类地方的人进行划分层次。问到宁波人的时候就只看宁波这第3层次就可以了，提高做题效率。另外一个例子是：一、人有不同部分组成头部上半身下半身脚这个例子就根据具体情况，虽然是一个人为一个整体，但是文章下面分

2、开部位进行介绍，那么这里就根据部位划分为4个层次。方便细节题回文定位。那么我们再以下面这篇文章为例：Asmallnumberoftheforestspeciesoflepidoptera(mothsandbutterflies,whichexistascaterpillarsduringmostoftheirlifecycle)exhibitregularlyrecurringpatternsofpopulationgrowthanddecline-suchfluctuationsinpopulationareknownaspopulationcycles.//A

3、lthoughmanydifferentvariablesinfluencepopulationlevels,aregularpatternsuchasapopulationcycleseemswww.gmatonline.cntoimplyadominant,drivingforce.//Identificationofthatdrivingforce,however,hasprovedsurprisinglyelusivedespiteconsiderableresearch.Thecommonapproachofstudyingcausesofpopulat

4、ioncyclesbymeasuringthemortalitycausedbydifferentagents,suchaspredatorybirdsorparasites,hasbeenunproductiveinthecaseoflepidoptera.Moreover,populationecologists'attemptstoaltercyclesbychangingthecaterpillars'habitatandbyreducingcaterpillarpopulationshavenotsucceeded.Inshort,theevidence

5、impliesthattheseinsectpopulations,ifnotself-regulating,mayatleastberegulatedbyanagentmoreintimatelyconnectedwiththeinsectthanarepredatorybirdsorparasites.Recentworksuggeststhatthisagentmaybeavirus.Formanyyears,viraldiseasehadbeenreportedindecliningpopulationsofcaterpillars,butpopulati

6、onecologistshadusuallyconsideredviraldiseasetohavecontributedtothedeclineonceitwasunderwayratherthantohaveinitiatedit.TherecentworkhasbeenmadepossiblebynewtechniquesofmolecularbiologythatallowviralDNAtobedetectedatlowconcentrationsintheenvironment.Nuclearpolyhedrosisvirusesarehypothes

7、izedtobethedrivingforcebehindpopulationcyclesinlepidopterainpartbecausethevirusesthemselvesfollowaninfectiouscycleinwhich,ifprotectedfromdirectsunlight,theymayremainvirulentformanyyearsintheenvironment,embeddedindurablecrystalsofpolyhedrinprotein.Onceingestedbyacaterpillar,thecrystals

8、disso