标题: 问小蓝一题 [打印本页] 作者: evelyn205205 时间: 2011-2-27 11:47 标题: 问小蓝一题 People who have spent a lot of time in contact with animals often develop animal-induced allergies, some of them quite serious. In a survey of current employees in major zoos, about 30 percent had animal-induced allergies. Based on this sample, experts conclude that among members of the general population who have spent a similarly large amout of time in close contact with animals, the percentage with animals-induced allergies is not 30 percent but substantially more. Which of the following, if true, provides the strongest grounds for the experts' conclusion? A. A zoo employee who develops a serious animal-induced allergy is very likely to switch to some other occupation. B. Azoo employee is more likely than a person in the general population to keep one or more animal pets at home. C. The percentage of the general population whose level of exposure to animals matches that of a zoo employee is quite small. D. Exposure to domestic pets is, on the whole, less likely to cause animal-induced allergy than exposure to many of the animals kept in zoos. E. Zoo employees seldom wear protective gear when they handle animals in their care. ANSWER: A. I CHOSE B. 希望各路牛牛帮我答疑解惑，谢谢啦~ 我认为A和原文没有什么关系嘛作者: sdcar2010 时间: 2011-2-27 12:41
Premise: Around 30% of current zoo employees have animal-induced allergy.
Conclusion: If people spend time with animals as long as an average zoo employee, the percentage of them who would develop animal-induced allergy is much higher than 30%.
Don't you think it is odd that the general population would have a higher chance to develop animal-induced allergy than zoo employees??? This is a paradox!
Well, if A is true, the conclusion holds and the paradox is explained. A says that a zoo employee can easily switch jobs to other professions. Therefore, a fast turnover at the zoo prevents some zoo employees from developing animal-induced allergies and being counted in the zoo employee category. This effectively leads to a lower percentage in allergy cases for zoo employees than it should be for people who spend long time everyday with animals.
B is a weakener.作者: ran2010zx 时间: 2011-2-27 13:59
小兰是啥。。。作者: evelyn205205 时间: 2011-2-27 17:46
XDF的蓝皮书作者: evelyn205205 时间: 2011-2-27 18:06
多谢sdcar2010~