Why do conservationists in Australia support the policy of killing cats?

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问题 Why do conservationists in Australia support the policy of killing cats?
  
In July 2015, the Australian government announced a "war on feral cats" with the intention of killing over two million felines by 2020. The threat abatement plan to enforce this policy includes a mix of shooting, trapping and a reputedly "humane" poison.
    Some conservationists in Australia are hailing this as an important step toward the rewilding of Australia’s outback, or the idea of restoring the continent’s biodiversity to its state prior to European contact. Momentum has also been building in the United States for similar action to protect many animals outdoor cats kill every year.
    In opposition are animal advocates including the British singer Morrissey who are appalled at the rhetoric of a war on cats and promote nonlethal methods of controlling the negative effects of cats as being more effective and humane.
    From a scientific perspective, there is little doubt that under particular geographic and ecological conditions, outdoor cats can threaten native species. This is especially true on oceanic islands whose wildlife evolved without cats and are consequently unadapted to feline predators. For example, when cats were introduced to Pacific islands by European colonists, their numbers grew until they frequently posed a threat to native wildlife.
    Some conservationists claim that cats are the single largest threat to biodiversity regardless of ecological context. One oft-cited study in Nature Comunicaciones claims that 1.4 to 3.7 billion birds and 6.9 to 20.7 billion small mammals are killed by cats every year in the United States alone. Yet some have pointed out that the scientific case for this claim is shaky at best.
    Why? Virtually every study of outdoor cats assumes that because cats in some habitats threaten biodiversity, they are a threat across all habitats everywhere. This is a projection from a small set of localized case studies to the world at large. In other words, a guesstimate.

选项 A、To kill the cats by shooting, trapping and poisoning.
B、To apply nonlethal methods to keep the influence under control.
C、To relocate the cats out of the continent to restore the ecology.
D、To find ways of protecting other animal species rather than killing the cats.

答案A

解析 事实细节的找寻与判断。原文第一段列举了猎杀野猫的措施,与选项A相符。选项B中“nonlethal”(非致命的) 为动物保护拥护者的主张,选项B错误。选项C和D在文中没有涉及。故本题应选择选项A。锁定题干所确定的区间,即所问为澳大利亚正在计划的政策,排除干扰项,其他主张不在本题回答范围内。
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