[求解] PREP08上的一道题

tracygmq

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.  utting 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.  robably, therefore, some substance in the tranquilizer inhibits fertility.
In evaluating the argument, it would be most useful to determine which of the following?

A. Whether there are more collared female rhinoceroses than uncollared female rhinoceroses in the park
B. How the tranquilizer that is used for immobilizing rhinoceroses differs, if at all, from tranquilizers used in working with other large mammals
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
D. Whether male rhinoceroses in the wildlife park lose their collars any more often than the park’s female rhinoceroses do
E. Whether radio collars are the only practical means that park rangers have for tracking the movements of rhinoceroses in the park

答案为什么是C呢？

tanklance

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.  utting 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.  robably, therefore, some substance in the tranquilizer inhibits fertility.
In evaluating the argument, it would be most useful to determine which of the following?

A. Whether there are more collared female rhinoceroses than uncollared female rhinoceroses in the park
B. How the tranquilizer that is used for immobilizing rhinoceroses differs, if at all, from tranquilizers used in working with other large mammals
C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
D. Whether male rhinoceroses in the wildlife park lose their collars any more often than the park’s female rhinoceroses do
E. Whether radio collars are the only practical means that park rangers have for tracking the movements of rhinoceroses in the park

答案为什么是C呢？

-- by 会员 tracygmq (2012/3/8 10:09:28)

个人看法是：
原文结论：some substance in the tranquilizer inhibits fertility。
要想评价文章，需要对结论进行evaluate。这里结论是一句判断句，所以我们需要看它是否为真。

A. 带圈儿的FR与不带圈儿的FR数量比较与镇静剂对生育能力是否有影响无关。
B. 该选项说的是镇静剂种类的区别，不涉及镇静剂对受体的影响。
C. 该选项是为了检测镇静剂使用的频率。若使用频率很小，则可以认为可能会是另外的原因影响了FR的生育能力。
D. 无关。
E. 无关。

LZ，我觉得C选项有点勉强，可能是自己水平不够吧。。。
欢迎更多人来讨论，期待NN们的解答~~