11. GWD17-Q11: Some species of Arctic birds are threatened by recent sharp increases in the population of snow geese, which breed in the Arctic and are displacing birds of less vigorous species.Although snow geese are a popular quarry for hunters in the southern regions where they winter, the hunting season ends if and when hunting has reduced the population by five percent, according to official estimates.Clearly, dropping this restriction would allow the other species to recover.
Which of the following, if true, most seriously undermines the argument?
A.Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese. B.It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date. C.The number of snow geese taken by hunters each year has grown every year for several years. D.As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons. E.In the snow goose’s winter habitats, the goose faces no significant natural predation.
答案选B，看了半天也没想明白B的逻辑是什么？It has been many years since 是说好多年前是这样，现在不会这样了，限制不会使得hunting提早结束，然后要如何达到削弱的目的？实在很困惑！~~
我复述一下，你看看我理解对了吗？ 文章的意思就是说一些鸟的数量下降是由于snow geese的数量上升，政府说如果对snow geese的捕杀超过5%就停止hunting.最后的结论是即使这项政策取消也不会使得鸟的数量上升。 A 很多年前的情况，与现在无关 C snow geese 每年被Hunting的数量上升，我觉得这个选项好像削弱了结论啊.....?? D无关？因为D讨论的是snow geese的选择居住地的问题 E 没看懂什么意思，是说snow geese没有猎物可以吃吗？
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发表于 2010-2-25 15:04:53
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