[求助]新prep-74

Fadaways

74.  

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?



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





马上考了，这题好像是GWD上的题，可是一时找不到了。文章意思是说要评价是否是some substance in the tranquilizer inhibits fertility。C里面说使用的频率,想不通啊

hedgeforfu

i am confused about C&A. i pick C.

C. How often park rangers need to use tranquilizer darts to immobilize rhinoceroses for reasons other than attaching radio collars
--if the the ranges use tranquilizer often, the conclusion is weak.
-- if the rangers use it rarely, the conclusion is justified.

so it's useful to determine whether rangers use t. often.

true?

liexodus

感觉C的重点不是how often, 而是for reasons other than attaching radio collars

原文假设没collare 的母犀牛体内就没有T，所以生殖能力好

rudder86

没有安装radio collar的犀牛和安装radio collar的犀牛 要在生育能力上进行比较,首先要说明他们注射的镇静剂的量是否一样 (比较的2者东西本质是以一样的)

MarilynR

我看到这道题的第一反应是：正确选项是：频繁挣脱radio collar的犀牛是因为她们不能怀孕而郁闷暴躁才弄掉的……一看选项里没有，就用的排除法，c感觉很绕，但是其它4个既不绕又是明显和结论无关