标题: prep7-1993-02-section4-Q1 逻辑解释 [打印本页] 作者: reveinsead 时间: 2009-6-14 06:37 标题: prep7-1993-02-section4-Q1 逻辑解释 Q1, in 1974 the speed limit on highways in the united states was reduced to 55 miles per hour in order to save fuel. in the first 12 months after the change, the rate of highway fatalities dropped 15 percent, the sharpest one-year drop i history. over the next 10 years, the fatality rate declined by another 25 percent. it follows that the 1974 reduction in the speed limit saved many lives.
which one of the following, if true, most strengthens the argument?
D) the fatality rate in highway accidents involving motorists driving faster than 55 miles per hour is much higher than in highway accidents that do not involve motorists driving at such speeds.
完全不明白为什么是这个选项， 我觉得很无关。希望能够帮忙解答一下。谢谢啦。
作者: kerry3210380 时间: 2009-6-22 01:00
但从选项来看。d)说 fatality rate is higher when speed>55, which means making the speed<=55 reduces the fatality rate,所以strengthen the argument
