In the nation of Partoria, large trucks currently account for 6 percent of miles driven on Partoria’s roads but are involved in 12 percent of all highway fatalities. The very largest trucks—those with three trailers—had less than a third of the accident rate of single- and double-trailer trucks. Clearly, therefore, one way for Partoria to reduce highway deaths would be to require shippers to increase their use of triple-trailer trucks.
Which of the following, if true, most seriously weakens the argument? A. No matter what changes Partoria makes in the regulation of trucking, it will have to keep some smaller roads off-limits to all large trucks. B. So far only the best, most experienced drivers for Partorian trucking companies have been driving triple-trailer trucks. C. Very few fatal collisions involving trucks in Partoria are collisions between two trucks. D. In Partoria, the safety record of the trucking industry as a whole has improved slightly over the past ten years. E. In Partoria, the maximum legal payload of a triple-trailer truck is less than three times the maximum legal payload of the largest of the single-trailer trucks. 答案是B，但是我不明白它的削弱方式，出题者的出题思维，它的因果关系怎样？
楼主估计没有理解这题的意思吧。 题目是说基于 triple-trailer trucks have less than a third of the accident rate of single-and double-trailer trucks 这样的事实，得出reduce accident rate 的一个方法是要求司机更多的去使用triple-trailer trucks 。
削弱可以给出他因，有因无果或者无因有果，这里是给出他因---是司机的技巧而不是车本身的性能好。 这题还有一个版本答案是 A.Partorian trucking companies have so far used triple-trailer trucks on lightly traveled sections of major highways only. 这也是给出他因，是说因为triple-trailer trucks 用的少，所以总事故少，并不是他的事故率低
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2011-5-28 13:05:39
收藏
收藏
楼主