※ 引述《lovekyoko (今年在芝加哥跨年 )》之铭言： : 81. A recent report determined that although only 3 percent of drivers on : Maryland highways equipped their vehicles with radar detectors, 33 percent of : all vehicles ticketed for exceeding the speed limit were equipped with them. : Clearly, drivers who equip their vehicles with radar detectors are more : likely to exceed the speed limit regularly than are drivers who do not. : The conclusion drawn above depends on which of the following assumptions? : (A) Drivers who equip their vehicles with radar detectors are less likely to : be ticketed for exceeding the speed limit than are drivers who do not. : (B)Drivers who are ticketed for exceeding the speed limit are more likely to : exceed the speed limit regularly than are drivers who are not ticketed. : 答案是B 但我对题目有一点模糊 : 题目说 在M高速公路3%的驾驶人装有雷达 接着说33 percent of all vehicles : 这是指在3%有雷达被开单的33%吗??? 换句话说有雷达车的有67%没有被开单 : 可以解释一下A和B吗 我大脑打结了 我也对assumption的部份有点感冒 有人提出 把选项取非 则题目不成立 这题是说3%的人有装雷达侦测器 但超速被开单的人里面33%有装雷达侦测器 所以很显然有装的人更容易超速 A说有装侦测器的人比较不可能被开超速罚单 (变成weaken了) B说收到罚单的人本来就是比较容易超速的人 (若取非 则变成这群被开单的人是不容易超速的 则与题目相反) 这样理解不知道对不对....前面爬文也有 --

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