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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? - Hunting limits for snow geese were imposed many years ago in response to a sharp decline in the population of snow geese.
- It has been many years since the restriction led to the hunting season for snow geese being closed earlier than the scheduled date.
- The number of snow geese taken by hunters each year has grown every year for several years.
- As their population has increased, snow geese have recolonized wintering grounds that they had not used for several seasons.
- In the snow goose’s winter habitats, the goose faces no significant natural predation.
Answer: ------------------------------------------------------------------------------------------------------------ 该题答案是B,我觉得不对. B说的是"It has been many years since [(the restriction led to the hunting season for snow geese being closed) earlier than the scheduled date]",我理解为"从 捕猎季被禁捕(因数量限制) 到 现在 已经是很多年了, 并且发布禁捕令的日期 比 预期的要早". 这意味着geese数量增加与禁止捕猎有关,那么如果取消5%的restriction,则捕猎开始→geese数量减少→其他鸟群recover. 可见B是加强原文论点. 而D说的是"geese已经开始拓宽其过冬的区域". 活动范围广了,相对来说,捕猎对该种群数量的影响就小了. 可能的结果是: 只要不全面扑杀,即使无5%的限制,猎人们的正常捕猎都阻止不了 geese总量的增加. 最终其他鸟群无法recover. 由此削弱了原文论点.
故我认为D正确. 再看其余选项:
A说"多年前因geese数量骤减,故有了restriction"→无restriction,则geese数量减少→其他鸟群recover, 加强原文论点.
C说"连续几年来,猎人们捕杀的geese数量一直在增加"→ 无restriction,则猎杀的数量继续增加→其他鸟群recover,加强原文论点.
E说"geese在其过冬的地方,无天敌" 这跟原文无关. 因为原文讲的是 geese数量、其他鸟群数量、猎人捕杀的geese数量 这三者之间的关系.
欢迎NN们拍砖!
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发表于 2007-5-26 15:58:00
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