GWD13-3-33一个选项是另一个选项的假设,怎么选?

kallyli

GWD13-3-33:

Wolves generally avoid human settlements.  For this reason, domestic sheep, though essentially easy prey for wolves, are not usually attacked by them.  In Hylantia prior to 1910, farmers nevertheless lost considerable numbers of sheep to wolves each year.  Attributing this to the large number for wolves, in 1910 the government began offering rewards to hunters for killing wolves.  From 1910 to 1915, large numbers of wolves were killed.  Yet wolf attacks on sheep increased significantly.

 

 

Which of the following, if true, most helps to explain the increase in wolf attacks on sheep?

 

 

1. Populations of deer and other wild animals that wolves typically prey on increased significantly in numbers from 1910 to 1915.
2. Prior to 1910, there were no legal restrictions in Hylantia on the hunting of wolves.
3. After 1910 hunters shot and wounded a substantial number of wolves, thereby greatly diminishing these wolves’ ability to prey on wild animals.
4. Domestic sheep are significantly less able than most wild animals to defend themselves against wolf attacks.
5. The systematic hunting of wolves encouraged by the program drove many wolves in Hylantia to migrate to remote mountain areas uninhabited by humans.

 

 

Choice D is exactly the basis of choice C. If domestic sheep are not “ less able than most wild animals to defend themselves against wolf attacks” will the wolves whose abilities of preying on wild animals diminished only attack domestic sheep?

Further more, C has another flaw of NO A, NO B. Are there only two kinds of animals? do they just feed on two kinds of animals without any alternatives? Does their lost-ability of preying on wild animals mean they must attack domestic sheep? All the answers are in question. So I don’t have any clue why C should be the answer.

 

 

[此贴子已经被作者于2006-7-18 18:36:38编辑过]

挥着猪翅膀

嗯。这个题我开始做的时候也头疼过。思考了很久才领悟到C，D细微的差别。

sheep, though essentially easy prey for wolves, are not usually attacked by them.这个是解题的一个约束条件。总的说来D和推理没有联系，原因如下：羊群较弱是客观存在的，不是因为狼群捕食能力遭到猎人的削弱才使得羊群较其他动物更易被捕食，D在这点上错误较隐晦，表面读来D项是正确的，可正确还不够，还得满足整个推理的需要。再看C：猎人大量射杀狼，因此极大地削弱了狼群的捕猎能力。这个选项中的因果关系很直白地告诉我们，是猎人促成了这一后果，因此建立了限制条件和结论的关系；再读前面那个约束条件，羊通常情况是不会被狼攻击的。如果按D那么说，狼何不一开始就避重就轻直接去吃羊呢？就是因为这个限制存在。

kallyli

谢谢你哦，一针见血了。呵呵。确实是我读题不仔细，没看见前提sheep, though essentially easy prey for wolves, are not usually attacked by them.
相比C更好。但是C还有点问题的。 就是非A即B，即没有能力捕wild animals ,就一定有能力补domestic sheep. 当时觉得是逻辑常犯错误，所以把它马上排除了。不过可能我钻牛角尖了。

挥着猪翅膀

这样来想吧。GWD给我的一个印象就是没有最完美的答案，很多题存在争议可能是因为我们认为它给的答案太过牵强。那就选一个比较好的选项。

vivian_chi

不是呀我觉得这题挺明显的，一看题就知道其实问题出在猎人和狼之间，因为政策改变的是人和狼的关系，所以提羊的都不看了，这题我总觉得似曾相识,中文就有人讨论过，这好像是一个真实的事件，我记得好像是读者还是哪个杂志讨论过这个问题,不知道我这个想法是不是能够更快的找到答案呢？大家指正呀~~

挥着猪翅膀

楼上的MM，不要用生活经历和知识积累去理解GMAT。