Inthedistantpast,friendreliedoneachotherfortheirsurvi...
问题详情： Inthedistantpast,friendreliedoneachotherfortheirsurvival.Theyhuntedtogetheranddefendedeachotheragainst61__________(danger)animalsandenemies.Inthosedays,ifyoudidn’thaveafriend,youwouldeith...