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
答案是C，我这道题选了正确答案，但是主要是因为其他选项可以排除掉，但是我不是很明白
collar掉，重新安装需要打麻药，经常重装的犀牛不孕，所以麻药导致不孕。是麻药导致的不孕，如果按照C的说法，ranger多久给这些犀牛打麻药而不是为了安装collar？那么回答的是否也不能说明麻药是否能导致不孕啊？
请高手指教一下，谢谢！
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