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1、乐考吧(http://www.lekaoba.com/)是一个温馨的考试学习交流社区，专门提供外语类、学历类，会计类、建筑类、医学类等考试信息服务。我们的口号是：快乐考试，分享生活。希望大家本着人人为我，我为人人的服务态度分享学习，共同成长，我们衷心为广大考友创造一个和谐、温暖的集学习交流与休闲娱乐为一体的综合性社区网站，我们前进的动力，只因有你。兄弟网站：第一考试网（http://www.onekao.com）.2010教育部考试中心考研英语模拟试题(新题型4)打包下载Directions: Youare
2、goingtoreadalistofheadingsandatextaboutpreparingintheacademiccommunity.ChoosethemostsuitableheadingfromthelistA-Fforeachnumberedparagraph(41-45).Thefirstandlastparagraphsofthetextarenotnumbered.Thereisoneextraheadingwhichyoudonotneedtouse.MarkyouranswersonA
3、NSWERSHEET1.(10points) UntilabouttwomillionyearsagoAfrica’svegetationhadalwaysbeencontrolledbytheinteractionsofclimate;geology,soil,andgroundwaterconditions;andtheactivitiesofanimals.Theadditionofhumanstothelattergroup,however,hasincreasinglyrenderedunreal
4、theconceptofafullydeveloped“natural”vegetation—i.e.,oneapproximatingtheidealofavegetationalclimax.(41).EarlyattemptsatmappingandclassifyingAfrica’svegetationstressedthisrelationship:sometimesthenamesofplantzoneswerederiveddirectlyfromclimates.Inthisdiscussi
5、ontheideaofzonesisretainedonlyinabroaddescriptivesense. (42).Inaddition,overtimemorefloralregionsofvaryingshapeandsizehavebeenrecognized.Manyschemeshavearisensuccessively,allofwhichhavehadtotakeviewsontwoimportantaspects:thegeneralscaleoftreatmenttobeadopt
6、ed,andthedegreetowhichhumanmodificationistobecomprehendedordiscounted. (43).Quitetheoppositeassumptionisnowfrequentlyadvanced.Anintimatecombinationofmanyspecies—incomplexassociationsandrelatedtolocalizedsoils,slopes,anddrainage—hasbeendetailedinmanystudies
7、oftheAfricantropics.Inafewsquaremilestheremaybeavisiblesuccessionfromswampwithpapyrus,thegrassofwhichtheancientEgyptiansmadepaperandfromwhichtheword“paper”originated,throughswampygrasslandandbroad-leavedwoodlandandgrasstoapatchofforestonricherhillsidesoil,a
8、ndfinallytojuicyfleshyplantsonanearlynakedrocksummit. (44).Correspondingly,classificationshavedifferedgreatlyintheirprinciplesfornaming,grouping,anddescribingformations:somehavechosentermssuchasforest
