英語(yǔ)專(zhuān)業(yè)八級(jí)考試閱讀理解試題帶答案

英語(yǔ)專(zhuān)業(yè)八級(jí)考試閱讀理解試題帶答案CrypticColoringCrypticcoloringisbyfarthecommonestuseofcolorinthestruggleforexistence.Itisemployedforthepurposeofattack(aggressiveresemblanceoranticrypticcoloring)aswellasofdefense(protectiveresemblanceorprocrypticcoloring).Thefactthatthesamemethodconcealment,maybeusedbothforattackanddefensehasbeenwellexplainedbyT.Beltwhosuggestsasanillustrationtherapidityofmovementwhichisalsomadeuseofbybothpursuerandpursued,whichissimilarlyraisedtoamaximuminbothbythegradualdyingoutoftheslowestthroughaseriesofgenerations.Crypticcoloringiscommonlyassociatedwithotheraidsinthestruggleforlife.Thuswell-concealedmammalsandbirds,whendiscovered,willgenerallyendeavortoescapebyspeedandwilloftenattempttodefendthemselvesactively.Ontheotherhand,smallanimalswhichhavenomeansofactivedefense,suchaslarge,numbersofinsects,frequentlydependuponconcealmentalone.Protectiveresemblanceisfarcommoneramonganimalsthanaggressiveresemblance,incorrespondencewiththefactthatpredaceousformsareasarulemuchlargerandmuchlessnumerousthantheirprey.InthecaseofinsectivorousVertebrataandtheirpreysuchdifferencesexistinanexaggeratedform.Crypticcoloring,whetherusedfordefenseofattack,maybeeithergeneralorspecial.Ingeneralresemblancetheanimal,inconsequenceofitscoloring,producesthesameeffectasitsenvironment,buttheconditionsdonotrequireanyspecialadaptationofshapeandoutline.Generalresemblanceisespeciallycommonamongtheanimalinhabitingsomeuniformlycoloredexpanseoftheearth’ssurface,suchasanoceanoradesert.Intheformer,animalsofallshapesarefrequentlyprotectedbytheirtransparentbluecolor,onthelatter,equallydiverseformsaredefendedbytheirsandyappearance.Theeffectofauniformappearancemaybeproducedbyacombinationoftintsinstartlingcontrast.Thustheblackandwhitestripesofthezebrablendtogetheratalittledistance,and“theirproportionissuchasexactlytomatchthepaletintwhicharidgroundpossesseswhenseenbymoonlight.”Specialresemblanceisfarcommonerthangeneralandistheformwhichisusuallymetwithonthediversifiedsurfaceoftheearth,ontheshores,andinshallowwater,aswellasonthefloatingmassesofalgaeonthesurfaceoftheocean,suchastheSargassoSea.Intheseenvironmentsthecrypticcoloringofanimalsisusuallyaidedbyspecialmodificationsofshape,andbytheinstinctwhichleadsthemtoassumeparticularattitudes.Completestillnessandtheassumptionofacertainattitudeplayanessentialpartingeneralresemblanceonland;butinspecialresemblancetheattitudeisoftenhighlyspecialized,andperhapsmoreimportantthananyotherelementinthecomplexmethodbywhichconcealmentiseffected.Inspecialresemblancethecombinationofcoloring,shape,andattitudeissuchastoproduceamoreorlessexactresemblancetosomeoneoftheobjectsintheenvironment,suchasaleafoftwig,apatchoflichen,aflakeofbark.Inallcasestheresemblanceistosomeobjectwhichisofnointeresttotheenemyorpreyrespectively.Theanimalisnothiddenfromviewbybecomingindistinguishablefromitsbackgroundasinthecaseofgeneralresemblance,butitismistakenforsomewell-knowobject.seekingtheinterpretationofthesemostinterestingandelaborateadaptations,attemptshavebeenmadealongtwolines.Thefirstseekstoexplaintheeffectasaresultofthedirectinfluenceoftheenvironmentupontheindividual(G.L.L.Buffon),orbytheinheritedeffectsofeffortsandtheuseanddisuseofparts(J.B.P.Lamarck).Thesecondbelievesthatnaturalselectionproducedtheresultandafterwardsmaintaineditbythesurvivalofthebestconcealedineachgeneration.Theformersuggestionbreaksdownwhenthecomplexnatureofnumerousspecialresemblancesisappreciated.Thusthearrangementofcolorsofmanykindsintoanappropriatepatternrequiresthecooperationofasuitableshapeandtherigidlyexactadoptionofacertainelaborateattitude.Thelatterisinstinctiveandthusdependsonthecentralnervoussystem.Thecrypticeffectisduetotheexactcooperationofallthesefactors;andinthepresentstateofscience,theonlypossibleholeofaninterpretationliesinthetheoryofnaturalselection,whichcanaccumulateanyandeveryvariationwhichtendstowardsurvival.Afewofthechieftypesofmethodsbywhichconcealmentiseffectedmaybebrieflydescribed.Thecolorsoflargenumbersofvertebrateanimalsaredarkestonthebackandbecomegraduallylighteronthesides,passingintowhiteonthebelly.AbbotH.Thayerhassuggestedthatthisgradationobliteratestheappearanceofsolidity,whichisduetoshadow.Thecolorharmony,whichisalsoessentialtoconcealment,isproducedbecausethebackisofthesametintastheenvironment(e.g.earth),bathedinthecoldblue-whiteofthesky,whilethebelly,beingcoldblue-whiteandbathedinshadowandyellowearthreflectionsproducesthesameeffects.ThismethodofneutralizingshadowforthepurposeofconcealmentbyincreasedlightnessoftintwasfirstsuggestedbyE.B.Poultoninthecaseofalarvaandapupa,buthedidnotappreciatethegreatimportanceoftheprinciple.Inananalogousmethodananimalinfrontofabackgroundofdarkshadowmayhavepartofitsbodyobliteratedbytheexistenceofadarktint,theremainderresembling,e.g.,apartofaleaf.Thismethodofrenderinginvisibleanypartwhichwouldinterferewiththeresemblanceiswellknowinmimicry.1.Theblackandwhitestripesofthezebraaremostusefulform[A]hunters.[B]nocturnalpredators[C]lionsandtigers.[C]insectivorousVertrbrata2.Aggressiveresemblanceoccurswhen[A]apredaceousattitudeisassumed.[B]specialresemblanceisutilized.[C]ananimalreliesonspeed.[D]ananimalblendsinwithitsbackground.3.Specialresemblancediffersfromgeneralresemblanceinthattheanimalrelieson[A]itsabilitytofrightenitsadversary.[B]speed.[C]itsabilitytoassumeanattitude.[D]mistakenidentify4.Thetitlebelowthatbestexpressestheidesofthispassageis[A]CrypticcolorationforProtection.[B]HowAnimalsSurvive.[C]TheusesofMimicryinNature.[D]ResemblancesofAnimals.