og cr 里有一道题我实在理解不了它的逻辑，麻烦大神解答一下

Ricardo0714 · 发表于 2022-11-5 16:36:48

Between1980 and 2000 the sea otter population of the Aleutian Islands declined precipitously. There were no signs of disease or malnutrition, so there wasprobably an increase in the number of otters being eaten by predators. Orcaswill eat otters when seals, their normal prey, are unavailable, and theAleutian Islands seal population declined dramatically in the 1980s. Therefore,orcas were most likely the immediate cause of the otter population decline.

Which of the following, if true, most strengthens the argument?

A.The population of sea urchins, the main foodof sea otters, has increased since the sea otter population declined.
B.Seals do not eat sea otters, nor do they compete with sea otters for food.
C.Most of the surviving sea otters live in a baythat is inaccessible to orcas.
D.The population of orcas in the AleutianIslands has declined since the 1980s.
E.An increase in commercial fishing near theAleutian Islands in the 1980s caused a slight decline in the population of the fish that seals use for food

这题选C。大多数的 sea otters 住在orcas去不到的地方不应该undermine这个argument吗，去不到的地方怎么还能怪orcas呢我转不过弯了。看了og的解释我也不是很理解，不知道是我钻牛角尖了还是漏了什么信息

Mordum · 发表于 2022-11-5 18:10:57

理解错C选项的意思了。不是大多数sea otters，是大多数surviving的sea otters——大多数活下来的都住在orcas接触不到的地方，也就是说接触不到orca才能活下来。

Ricardo0714 · 发表于 2022-11-5 21:01:19

Mordum 发表于 2022-11-5 18:10
理解错C选项的意思了。不是大多数sea otters，是大多数surviving的sea otters——大多数活下来的都住在orca ...

感谢回复，这一点确实是我的疏忽，不过我还是没理解透彻，大多数活下来的都住在orcas去不到的地方貌似和argument中 orcas 捕食sea otter 导致其数量减少没有关系把

leon申哥 · 发表于 2022-11-5 21:18:21

Ricardo0714 发表于 2022-11-5 21:01
感谢回复，这一点确实是我的疏忽，不过我还是没理解透彻，大多数活下来的都住在orcas去不到的地方貌似和a ...

没有幸存的，住在bay外的都被 orcas 干掉了。
E选项为什么不可以呢，海豹的食物变少了，orcas 吃海豹，海豹少了，orcas只能吃otter了，这不对嘛

Ricardo0714 · 发表于 2022-11-6 16:32:09

leon申哥发表于 2022-11-5 21:18
没有幸存的，住在bay外的都被 orcas 干掉了。
E选项为什么不可以呢，海豹的食物变少了，orcas 吃海豹， ...

这题我感觉og给的解释不是很让人信服，C选项和E选项的解释都不是很合理。og说因为商业捕鱼的缘故，sea otters可能也缺乏食物，sea otter的数量减少有可能是因为 commercial fishing 而不是 orcas的捕食

og cr 里有一道题我实在理解不了它的逻辑，麻烦大神解答一下

所属分类: GMAT考试

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