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Liz Bonnin presents a controversial and provocative episode of Horizon, investigating how new scientific research is raising hard questions about zoos - the film explores how and why zoos keep animals, and whether they need to change to keep up with modern science or ultimately be consigned to history.Should zoos cull their animals to manage populations? Liz travels to Copenhagen Zoo, who killed a giraffe and fed it to the lions, to witness their culling process first hand. They think it is a natural part of zoo keeping that is often swept under the carpet. Should some animals never be kept in captivity? In a world exclusive, Liz visits SeaWorld in Florida and asks if captivity drove one of their orcas to kill his trainer.But could zoos be the answer to conserving endangered species? Liz examines their record, from helping breed pandas for the wild to efforts to save the rhinos. She meets one of the last surviving northern white rhinos and discovers the future of this species now lies in a multimillion-dollar programme to engineer them from stem cells. Veteran conservation scientist Dr Sarah Bexell tells Liz the science of captive breeding is giving humanity false hope.Deployment/retraction landing gear G G only works if the landing gear of the current aircraft is retractable.7, and so on, divided into the first, second and third places想是我外公外婆和赵三爷爷三奶奶咽不下这口气，去胡家找他们长辈理论去了。《权力的游戏》故事进行到第六季，提利昂（彼特·丁拉基 Peter Dinklage 饰）和瓦利斯（康雷斯·希尔 Conleth Hill 饰）渡海投奔龙母丹妮莉丝（艾米莉亚·克拉克 Emilia Clarke 饰），可后者却亦处于困境之中，复国计划停滞不前。　　这群活宝站在人生的十字路口，无所不用其极，干出一件又一件疯狂的事情，在毕业季的迷茫坎坷之路上越挫越勇，演绎出自己的人生疯狂喜剧。为了确保超人没有白白牺牲，蝙蝠侠和神奇女侠计划招募一支超人类团队来保护世界，这项任务比布鲁斯设想要困难得多，因为每个新人都必须面对并跨越自己过去的心魔，团结起来，最终形成前所未有的联盟。只是一切可能为时已晚，无法从荒原狼、狄萨德和达克赛德的计划中拯救地球……