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1、2000年5月TOEFL试题SectionThree:ReadingComprehensionQuestion1-9Thecanopy,theupperlevelofthetreesintherainforest,holdsaplethoraofclimbingmammalsofmoderatelylargesize,whichmayincludemonkeys,cats,civets,andporcupines.Smallerspecies,includingsuchrodentsasmiceandsmallsquirrels,aren
2、otlineasprevalentoverallinhightropicalcanopiesastheyareinmosthabitatsglobally.(5)Smallmammals,beingwarmblooded,sufferhardshipintheexposedandturbulentenvironmentoftheuppermosttrees.Becauseasmallbodyhasmoresurfaceareaperunitofweightthanalargeoneofsimilarshape,itgainsorloses
3、heatmoreswiftly.Thus,inthetrees,whereshelterfromheatandcoldmaybescarceandconditionsmayfluctuate,asmallmammalmayhavetroublemaintainingitsbodytemperature.(10)Smallsizemakesiteasytoscrambleamongtwigsandbranchesinthecanopyforinsects,flowers,orfruit,butsmallmammalsaresurpassed
4、,inthecompetitionforfood,bylargeonesthathavetheirowntacticsforbrowsingamongfood-richtwigs.Theweightofagibbon(asmallape)hangingbelowabrancharchestheterminalleavesdownsothatfruit-bearingfoliagedropstowardthegibbon’sface.Walkingorleapingspeciesofa(15)similarorevenlargersizea
5、ccesstheoutertwigseitherbysnappingoffandretrievingthewholebranchorbyclutchingstiffbrancheswiththefeetortailandpluckingfoodwiththeirhands.Smallclimbinganimalsmayreachtwigsreadily,butitisharderforthemthanforlargeclimbinganimalstocrossthewidegapsfromontreecrowntothenextthatt
6、ypifythe(20)highcanopy.Amacaqueorgibboncanhurlitselffartherthanamousecan:itcanachievearunningstart,anditcanmoreeffectivelyuseabranchasaspringboard,evenbouncingonaclimbseveraltimesbeforejumping.Theforwardmovementofasmallanimalisseriouslyreducedbytheairfrictionagainsttherel
7、ativelylargesurfaceareaofitsbody.Finally,forthemanysmallmammalsthatsupplementtheirinsectdietwithfruitsorseeds(25)aninabilitytospanopengapsbetweentreecrownsmaybeproblematic,sincetreesthatyieldthesefoodscanbesparse.1.Thepassageanswerswhichofthefollowingquestions?(A)Howisthe
8、rainforestdifferentfromotherhabitats?(B)Howdoesananimal’sbodysizeinfluenceananimal’sneedforfood?
