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1、2000年5月TOEFL试题SectionThree:ReadingComprehensionQuestion1-9Thecanopy,theupperlevelofthetreesintherainforest,holdsaplethoraofclimbingmammalsofmoderatelylargesize,whichmayincludemonkeys,cats,civets,andporcupines.Smallerspecies,includingsuchrodentsasmiceandsm
2、allsquirrels,arenotasprevalentoverallinhightropicalcanopiesastheyareinmosthabitatsglobally.Smallmammals,beingwarmblooded,sufferhardshipintheexposedandturbulentenvironmentoftheuppermosttrees.Becauseasmallbodyhasmoresurfaceareaperunitofweightthanalargeoneof
3、similarshape,itgainsorlosesheatmoreswiftly.Thus,inthetrees,whereshelterfromheatandcoldmaybescarceandconditionsmayfluctuate,asmallmammalmayhavetroublemaintainingitsbodytemperature.Smallsizemakesiteasytoscrambleamongtwigsandbranchesinthecanopyforinsects,flo
4、wers,orfruit,butsmallmammalsaresurpassed,inthecompetitionforfood,bylargeonesthathavetheirowntacticsforbrowsingamongfood-richtwigs.Theweightofagibbon(asmallape)hangingbelowabrancharchestheterminalleavesdownsothatfruit-bearingfoliagedropstowardthegibbon’sfa
5、ce.Walkingorleapingspeciesofasimilarorevenlargersizeaccesstheoutertwigseitherbysnappingoffandretrievingthewholebranchorbyclutchingstiffbrancheswiththefeetortailandpluckingfoodwiththeirhands.Smallclimbinganimalsmayreachtwigsreadily,butitisharderforthemthan
6、forlargeclimbinganimalstocrossthewidegapsfromontreecrowntothenextthattypifythehighcanopy.Amacaqueorgibboncanhurlitselffartherthanamousecan:itcanachievearunningstart,anditcanmoreeffectivelyuseabranchasaspringboard,evenbouncingonaclimbseveraltimesbeforejump
7、ing.Theforwardmovementofasmallanimalisseriouslyreducedbytheairfrictionagainsttherelativelylargesurfaceareaofitsbody.Finally,forthemanysmallmammalsthatsupplementtheirinsectdietwithfruitsorseedsaninabilitytospanopengapsbetweentreecrownsmaybeproblematic,sinc
8、etreesthatyieldthesefoodscanbesparse.1.Thepassageanswerswhichofthefollowingquestions?(A)Howistherainforestdifferentfromotherhabitats?(B)Howdoesananimal’sbodysizeinfluenceananimal’sneedforfood?(C)Whydoestherainforest
