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1、小马过河www.xiaomaguohe.net2000年5月TOEFL试题SectionThree:ReadingComprehensionQuestion1-9Thecanopy,theupperlevelofthetreesintherainforest,holdsaplethoraofclimbingmammalsofmoderatelylargesize,whichmayincludemonkeys,cats,civets,andporcupines.Smallerspecies,includings
2、uchrodentsasmiceandsmallsquirrels,arenotlineasprevalentoverallinhightropicalcanopiesastheyareinmosthabitatsglobally.(5)Smallmammals,beingwarmblooded,sufferhardshipintheexposedandturbulentenvironmentoftheuppermosttrees.Becauseasmallbodyhasmoresurfaceareaperu
3、nitofweightthanalargeoneofsimilarshape,itgainsorlosesheatmoreswiftly.Thus,inthetrees,whereshelterfromheatandcoldmaybescarceandconditionsmayfluctuate,asmallmammalmayhavetroublemaintainingitsbodytemperature.(10)Smallsizemakesiteasytoscrambleamongtwigsandbranc
4、hesinthecanopyforinsects,flowers,orfruit,butsmallmammalsaresurpassed,inthecompetitionforfood,bylargeonesthathavetheirowntacticsforbrowsingamongfood-richtwigs.Theweightofagibbon(asmallape)hangingbelowabrancharchestheterminalleavesdownsothatfruit-bearingfolia
5、gedropstowardthegibbon’sface.Walkingorleapingspeciesofa(15)similarorevenlargersizeaccesstheoutertwigseitherbysnappingoffandretrievingthewholebranchorbyclutchingstiffbrancheswiththefeetortailandpluckingfoodwiththeirhands.Smallclimbinganimalsmayreachtwigsread
6、ily,butitisharderforthemthanforlargeclimbinganimalstocrossthewidegapsfromontreecrowntothenextthattypifythe(20)highcanopy.Amacaqueorgibboncanhurlitselffartherthanamousecan:itcanachievearunningstart,anditcanmoreeffectivelyuseabranchasaspringboard,evenbouncing
7、onaclimbseveraltimesbeforejumping.Theforwardmovementofasmallanimalisseriouslyreducedbytheairfrictionagainsttherelativelylargesurfaceareaofitsbody.Finally,forthemanysmallmammalsthatsupplementtheirinsectdietwithfruitsorseeds(25)aninabilitytospanopengapsbetwee
8、ntreecrownsmaybeproblematic,sincetreesthatyieldthesefoodscanbesparse.7小马过河www.xiaomaguohe.net1.Thepassageanswerswhichofthefollowingquestions?(A)Howistherainforestdifferentfromotherhabitats?(B)Howdoesan
