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　 此时，一位经验丰富的国际刑警Lee已经对O进行了5年以上的追踪。正是Lee揭露了奥运会神枪手Lok Gan Wah和他年轻的弟弟Lok Tai Wah患上大脑疾病而在比赛失利的事件。这两位神枪手在失去金牌后神秘地消失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.如今夜郎那边的情况正好验证了实际情况。张槐听了连连点头，觉得他家小闺女肯定会这样说。2012年3月14日CBS宣布续订第三季。随后。也不知小娃儿是如何做到的，愣是一声不吭，最后居然闭上了眼睛，众人无法可想。