英语六级巅峰阅读附详解-第71期-动物世界.docx

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英语六级巅峰阅读附详解第71期:动物世界

Naturally,magroupofanimalsasdiverseasthesnakes,andwithsomanyvariedenemies.therearenumerousdefensivereactionsanddevices.Thereis.however,onegeneralpatternofbehavior.Inthepresenceofsuspectedenemythefirstreactionistotrytoescapeobservation;ifthisfails,thenextresortistheflightcosomeinaccessibleretreat,butifthisisnotpossible,oriscircumvented.variouskindsofintimidatorygesturesandwarningdevicesarebroughtintoplay;inthelastresortthesnakeattacks.Thispatternvaneswiththecircumstances;somestagesmaybeomittedorcombinedunpredictablywhilstallsomenotoriouslyirasciblespeciesmaydispensewithallthepreliminariesandattackalmostatonce.thoughseldomorneverwithoutsomeprovocation.Amongstthefactorsthatincreaseaggressivenessarehunger,thematingseasonandsurprise,withthelastmentionedthecommonest;whenhuntingforfoodorformate.activityandtheaggressiveinstinctarebothattheirpeak.Owingtotheirpoorsenseofhearingsnakesareveryliabletobe,quiteliterally,caughtnappingandasimilarsituationarisesduringtheirperiodsoftemporaryblindnessjustbeforesloughing(蜕皮）begins.Byfarthegreatestnumberofsnake-bitaccidentsresultfromtheunwittingdisturbanceofrestingsnakes.andthishazardismuchincreasedwithspeciesthatarewelldisguisedandwhosenaturalinstinctistotrusttothisconcealmentastheirprincipaldefense.Aswellasdifferencesinaggressivenessbetweenindividualsofthesamespeciesaccordingtothecircumstancesandconditions,therearealsonotabledifferencesbetweenspecies,evencloselyalliedspecies;andthereportsofthosewhohavebeenattackedmayunderstandablybelackinginobjectivity.Soitisimpossibletoforecast.eveninoutline,howanyencounterwilldevelop.TheHamadryad,forexample,isusuallycreditedwithbeingamongstthemostaggressiveofsnakes.andtherearemanyaccountsofunprovokedattacks,yetononeoccasionfourteenmenandsevendogspassedandreturnedwithintwoyardsfromanestandnosnakewasseenalthoughthefemale.whichguardsthenest,couldnothavebeenfaraway.蛇的品种繁多。有各式各样的天敌，无疑，它们有数之不尽的防御方式和武器。但是，它们有一种共同的行为模式。[1]在遇到可疑的敌人时，它