题目内容：
听音频，回答题 Pointataballandadogwilllookattheball,whereasacatwillprobablylookatyourhand.Dogsseemtohaveareadyunderstandingofhowhumanbeingsdirect26bypointing.
Ofcourse,dogs27aren'tbornknowinganythingaboutpeople.Wejustcarefullytrainthemtolook,fetch,andsoon,right?A28psychologistattheMaxPlankInstituteinGermanynamedMichaelTomaselloran29testsondogs,inwhichtheyhadtofindwhichsealedcontainerhadyummydogfoodinit.Theonly30theygotwasfromahumanbeingwholookedatorpointedattherightcontainer.Thiswasn'thardfordogsatall.
Butitwashardforwolves.Wolvesthathavebeen31bypeopleshouldhavethesamesuccessatfindingthesealedcontainer,buttheydidn't.Evenchimpanzees,whichareverysmartanimalsindeed,weren'tasfastatfindingthefoodasdogs.Whatdoesthismean?One32isthatdogsdo,infact,haveanaturalabilitytounderstandformsofhumancommunication.Evennine-weekoldpuppiesfoundthefood,33theskillistherebeforetraining.Wolvesdon'thavetheskill,suggestingthatithasdevelopedindogssincethetimethey34theirevolutionarypredecessors.
Thereisdebateaboutthisidea.ButTomasellothinksthatinthepast15,000years,ashumanbeingsanddogshaveevolvedtogether,thebasisfordog'sabilitytounderstandwhatyoumeanmayhavebecome35inhisgenes.
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