我记得有另外一题是跟这题相同题干但是问的 方式不同 这题的推论应该是这样 use tranquilizer darts -> Low fertility Low ertility 是确定已发生的事实数据 应此可能是另有他因 也就是说不一定是 tranquilizer darts造成 low fertility use tranquilizer and then Recollar -> Low fertility (很明显的题干结论漏掉 recollar这动作 一定有漏洞! ) 会不会是 recollar这个动作造成 female 身心受创而不孕?! 所以答案C 的意思是 要证明是 tranquilizer 而不是recollar 造成 Low F 比如说 100只 注射tranquilizer , 一部分50只 recollar, 是不是还是100只不孕 如果是50只 代表是 RECOLLAR 造成 ※ 引述《pilichat (人生需要不断冒险)》之铭言： : 74. (29534-!-item-!-188;#058&004138) : 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 : 删到最後剩下C : C也是正确答案 : 但看不懂因为其他原因而注射麻醉的频率,和题干有什麽连结... --

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