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 镇定剂dart标枪.Female rhinoceroses that have been frequently recollared have significantly lower fertility繁殖力 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 作者: sabrinazheng 时间: 2010-5-20 10:49
c????????????作者: 裴小臻grace 时间: 2010-5-20 10:52
对啊，答案是C~~我很无语~~~虽然知道答案之后会觉得别的真的也没有什么正确的可能性，但是凭什么就选了C呢~~~我无语作者: sabrinazheng 时间: 2010-5-20 19:28
额。。这样说吧。female--如果很经常被使用 tranquilizer darts for reasons other than attaching radio collars （他因）那么recollar 就不能是意味这frequenency of shooting the animals. 本来建立的关系。frequently recollar--- shooting it with a tranquilizer--lower fertility 现在期中一个联系被打断。 额。。也不知这样说对不对哈~~期待nn来作者: 裴小臻grace 时间: 2010-5-20 19:43
可是最后的结论不是说是镇定剂使得繁殖能力降低嘛
结论里面都没有说是因为recollar啊作者: gjjemily 时间: 2010-5-20 20:40 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 镇定剂dart标枪.Female rhinoceroses that have been frequently recollared have significantly lower fertility繁殖力 rates than uncollared females.Probably, therefore, some substance in the tranquilizer inhibits fertility.