In the late 1980’s, the population of sea otters in the North Pacific Ocean began to decline. Of the two答案解析-雷哥GMAT

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In the late 1980’s, the population of sea otters in the North Pacific Ocean began to decline. Of the two plausible explanations for the decline—increased predation by killer whales or disease—disease is the more likely. After all, a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution-related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably.

Which of the following, if true, most seriously weakens the reasoning?

A

Killer whales in the North Pacific usually prey on seals and sea lions but will, when this food source is scarce, seek out other prey.
分析A选项
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B

There is no indication that substantial numbers of sea otters migrated to other locations from the North Pacific in the 1980’s.
分析B选项
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C

Along the Pacific coast of North America in the 1980＇s, sea otters were absent from many locations where they had been relatively common in former times.
分析C选项
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D

Following the decline in the population of the sea otters, there was an increase in the population of sea urchins, which are sea otters’ main food source.
分析D选项
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E

The North Pacific populations of seals and sea lions cover a wider geographic area than does the population of sea otters.
分析E选项
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当前版本由百香果蜂蜜茶更新于2015-12-29 11:43:05 感谢由百香果蜂蜜茶对此题目的解答所做出的贡献。

原文是说有两个可能的原因，一个是虎鲸的捕杀，一个是疾病，而疾病应该是主要原因，因为其他的动物如海狮都感染了疾病大量死亡。选驳斥，那么A是最佳选项，因为A说虎鲸在没有海狮吃的时候会吃其他的动物，也就间接说明了由于海狮感染疾病大量死亡，可能导致虎鲸大量捕杀SO，也就是说，SO数量的下降和疾病没有关系。

题目讨论（3条评论）

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Byrant

a concurrent sharp decline in the populations of seals and sea lions was almost certainly caused by a pollution-related disease, which could have spread to sea otters, whereas the population of killer whales did not change noticeably.这是论据。我们要推翻disease成立predation。这道题的关键-就是whereas the population of killer whales did not change noticeably。如果是患病-otters应该自觉减少-whales食物不够要减少。选项A提供了思路：捕杀seals和sea lions（因疾病而减少）不够吃再吃otters.

0 回复 2019-09-12 09:50:50

romay700

background：sea otter数量的降低有两个原因，一个是killer whales的捕杀增加，另一个是疾病。
premise 1：大量的sea lions和seals死于疾病，这种疾病可以传染给sea otter
premise 2：killer whales的数量没有增加
conclusion：这次sea otter数量减少是因为疾病。

A.CORRECT.因为killer whales的其他食物减少了，在数量不变的情况下对sea otter的捕杀会增多。
B.没有迹象表明otter迁徙到其他地方。无关选项，（甚至增强）
C.无关选项
D.无关选项
E.无关选项

0 回复 2018-04-17 17:01:06

romay700

background：sea otter数量的降低有两个原因，一个是killer whales的捕杀增加，另一个是疾病。
premise 1：大量的sea lions和seals死于疾病，这种疾病可以传染给sea otter
premise 2：killer whales的数量没有增加
conclusion：这次sea otter数量减少是因为疾病。

A.CORRECT.因为killer whales的其他食物减少了，在数量不变的情况下对sea otter的捕杀会增多。
B.没有迹象表明otter迁徙到其他地方。无关选项，（甚至增强）
C.无关选项
D.无关选项
E.无关选项

0 回复 2018-04-17 17:00:35