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本題由lindy提供
In a certain wildlife park, park rangers are able to
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
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前提：要
結(jié)論：麻醉劑導(dǎo)致母犀牛生育率下降
題目的關(guān)鍵在于collar和麻醉劑是連在一起的，所以推出recollar的犀牛是由于麻醉劑而生育率低，所以打破這種相關(guān)關(guān)系的關(guān)鍵在于把麻醉劑和collar分開。
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