Dogswillrefusefoodofferedbypeoplewhohaverefusedtohelpth...
问题详情：Dogswillrefusefoodofferedbypeoplewhohaverefusedtohelptheirowners,someresearcherssaidlastFriday.Thestudyledbytheresearchersshowedthatdogshavetheabilitytoco-operate(合作)socially-anabilityfoundi...