GRE阅读做题指导手记

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1、GRE阅读做题指导手记GRE阅读以艰深着称，很多理论讲解使得考生觉得如雾里云中，下面，我带大家来一起做一篇题目Overtheyears,biologistshavesuggestedtwomainpathwaysbywhichsexualselectionmayhaveshapedtheevolutionofmalebirdsong。这是本文的主题句，告诉我们一下的信息：1.本文探讨的是一个现象，是关于鸟的歌曲的性选择问题。2.本文是一个新老观点对比型的文章，关键词在第一段中间或者第二段开头3.本文谈到了进化论，那么在文章后面很可能会否定这个说法，并且可能会进行批驳。4

2、・下文会以性内和性间选择分别展开进行论述。Inthefirst,malecompetitionandintrasexualselectionproducerelativelyshort,simplesongsusedmainlyinterritorialbehavioroInthesecond,femalechoiceandintersexualselectionproducelonger,morecomplicatedsongsusedmainlyinmateattraction;likesuchvisualornamentationasthepeacock'stai

3、l,elaboratevocalcharacteristicsincreasethemale'schancesofbeingchosenasamate,andhethusenjoysmorereproductivesuccessthanhislessostentatiousrivalsoThetwopathwaysarenotmutuallyexclusive,andwecanexpecttofindexamplesthatreflecttheirinteraction。Teasingthemaparthasbeenanimportantchallengetoevolu

4、tionarybiologistsoEarlyresearchconfirmedtheroleofintrasexualselectionoInavarietyofexperimentsinthefield,malesrespondedaggressivelytorecordedsongsbyexhibitingterritorialbehaviornearthespeakersThebreekphvoqglborresearch$intkmnpevsexualselectioncameinthedevelopmentofanewtechniqueforinvestig

5、atingfemaleresponseinthelaboratoryoWhenfemalecowbirdsraisedinisolationinsound・proofchamberswereexposedtorecordingsofmalesong,theyrespondedbyexhibitingmatingbehavioroByquantifyingtheresponses,researcherswereabletodeterminewhatparticularfeaturesofthesongweremostimportantoInfurtherexperimen

6、tsonsongsparrows,researchersfoundthatwhenexposedtoasinglesongtyperepeatedseveraltimesortoarepertoireofdifferentsongtypes,femalesrespondedmoretothelatteroThebeautyoftheexperimentaldesignisthatiteffectivelyrulesoutconfoundingvariables;acousticisolationassuresthatthefemalecanrespondonlytoth

7、esongstructureitselfoIfintersexualselectionoperatesastheorized,maleswithmorecomplicatedsongsshouldnotonlyattractfemalesmorereadilybutshouldalsoenjoygreaterreproductivesuccessoAtfirst,however,researchersdoingfieldworkwithsongsparrowsfoundnocorrelationbetweenlargerrepertoir