本贴相关题目 GMATPrep-2008E2-CR-74 (CXHU)

00:00:00

In a certain wildlife park, park rangers are able to track the movements of many rhinoceroses because those animals wear radio collars. When, as often happens, a collar slips off, it is put back on. Putting a collar on a rhinoceros involves immobilizing the animal by shooting it with a tranquilizer dart. Female rhinoceroses that have been frequently recollared have significantly lower fertility rates than uncollared females. Probably, therefore, some substance in the tranquilizer inhibits fertility.

In evaluating the argument, it would be most useful to determine which of the following?

AWhether there are more collared female rhinoceroses than uncollared female rhinoceroses in the park
BHow the tranquilizer that is used for immobilizing rhinoceroses differs, if at all, from tranquilizers used in working with other large mammals
CHow often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
DWhether male rhinoceroses in the wildlife park lose their collars any more often than the park's female rhinoceroses do
EWhether radio collars are the only practical means that park rangers have for tracking the movements of rhinoceroses in the park

正确答案: C

求教prep一逻辑~

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ptlove4ever

楼主

发表于 2011-12-2 16:46:54 | 显示全部楼层

正确答案：C 我错选了D。
题目翻译：护林员用追踪器记录犀牛的行踪，追踪器经常会掉，掉了需要重戴，重戴需要注射镇定剂。发现被重戴追踪器的母犀牛比没戴过追踪器的母犀牛繁殖力低，所以断定：镇定剂会降低母犀牛的繁殖力。
推理过程：因为重戴追踪器母犀牛的比没戴过追踪器母犀牛的繁殖力低，重戴追踪器需要打镇定剂，没戴过追踪器的母犀牛自然没打过镇定剂，所以镇定剂使繁殖力降低。
但是“没戴过追踪器的母犀牛自然没打过镇定剂”这句话原文从未提及，这不过是我们的假设，所以只要被推翻，则题目不成立。
C：会不会因为除了重戴追踪器以外的原因，需要给犀牛打镇定剂呢？C中说这个how often就体现了，如果对C回答YES，就是存在这样的可能，很好的反驳了原文结论。如果对C回答NO，则支持原文。因此选择C选项。
题目解析：本题属于典型的现象解释文，反驳：有其他的解释。不是镇定剂让她们的繁殖能力下降。这是一道评价题，应该选择一个选项，对其回答YES和NO将会对结论产生完全相反的影响。
话题关键词：镇定剂，犀牛