Humansaresocialanimals．Theyliveingroupsallovertheworld...
问题详情： Humansaresocialanimals．Theyliveingroupsallovertheworld．Asthesegroupsofpeopleliveapartfromothergroups，overtheyearsandcenturiestheydeveloptheirownhabitsandideas，whichformdifferentcultures．Oneimport...