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1、2005年passage1Everybodylovesafatpayrise.Yetpleasureatyourowncanvanishifyoulearnthatacolleaguehasbeengivenabiggerone.Indeed,ifhehasareputationforslacking,youmightevenbeoutraged.Suchbehaviourisregardedas“alltoohuman”,withtheunderlyingassumptionthatotherani
2、malswouldnotbecapableofthisfinelydevelopedsenseofgrievance.ButastudybySarahBrosnanandFransdeWaalofEmoryUniversityinAtlanta,Georgia,whichhasjustbeenpublishedinNature,suggeststhatitalltoomonkey,aswell.Theresearchersstudiedthebehaviouroffemalebrowncapuchin
3、monkeys.Theylookcute.Theyaregood-natured,co-operativecreatures,andtheysharetheirfoodtardily.Aboveall,liketheirfemalehumancounterparts,theytendtopaymuchcloserattentiontothevalueof“goodsandservices”thanmales.Suchcharacteristicsmakethemperfectcandidatesfor
4、Dr.Brosnan'sandDr.dewaal's。study.Theresearchersspenttwoyearsteachingtheirmonkeystoexchangetokensforfood.Normally,themonkeyswerehappyenoughtoexchangepiecesofrockforslicesofcucumber.However,whentwomonkeyswereplacedinseparatebutadjoiningchambers,sothateach
5、couldobservewhattheotherwasgettinginreturnforitsrock,theirbehaviourbecamemarkedlydifferent. Intheworldofcapuchinsgrapesareluxurygoods(andmuchpreferabletocucumbers)Sowhenonemonkeywashandedagrapeinexchangeforhertoken,thesecondwasreluctanttohandhersoverf
6、oramerepieceofcucumber.Andifonereceivedagrapewithouthavingtoprovidehertokeninexchangeatall,theothereithertossedherowntokenattheresearcheroroutofthechamber,orrefusedto。acceptthesliceofcucumberIndeed,themerepresenceofagrapeintheotherchamber(withoutanactua
7、lmonkeytoeatit)wasenoughtoreduceresentmentinafemalecapuchin. Theresearchessuggestthatcapuchinmonkeys,likehumans,areguidedbysocialemotions,inthewild,theyareaco-operative,grouplivingspecies,Suchco-operationislikelytobestableonlywheneachanimalfeelsitisnotb
8、eingcheated.Feelingsofrighteousindignation,itseems,arenotthepreserveofpeoplealone,Refusingalesserrewardcompletelymakesthesefeelingsabundantlycleartoothermembersofthegroup.However,whethersuchasenseoffairnessevolvedindependentlyinc
