eightofletters EThereareseveralwaysoftestingtheintelligence(智力)ofanimals.est,somescientistsputthreeplatesonthetable.Whiletheanimalwatched,theyputfoodunderoneoftheplates.Thentheytooktheanimalaway.Sometimelater,theybroughtitbacktoseeifitrememberedwhichplatehadthefood.Theideaistofindouthowlongananimal’smemorycanlast.Thescientistswouldtryshowingtheplatetotheanimalonehourlater,ortwohourslater,orevenafulldaylater.Theyfoundoutthatchimpanzeesandelephantshavethebestmemory,andareabletorememberthecorrectplateforatleasttwentyhours.Nootheranimalisclose.enext,buttheycanonlyrememberforninehours.Thescientistsmadealargemaze(迷宫)andranthechimpanzeesandelephantsthroughit.Themazewasverydifficultwithmanydeadends.Ittookthechimpanzeestenminutestofindtheirwayout.Theelephantsneededhalfanhour.Thetestshowedthatchim
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