GMAT的assumption题目应该怎么做

无风不起浪味仙学习英语ingUID：4071322

Assumption题又称假设题，它和支持题不一样，支持题支持题是提高可能性,而假设题目是使之成立。Assumption题是非常考察逻辑思维的一种题型，有时候可能感觉自己理解题目了，但是答案却选不对。

我们可以先看一个例子：
A recent report determined that although only three percent of drivers on Maryland highways equipped their vehicles with radar detectors, thirty-three 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.
C. The number of vehicles that were ticketed for exceeding the speed limit was greater than the number of vehicles that were equipped with radar detectors.
D. Many of the vehicles that were ticketed for exceeding the speed limit were ticketed more than once in the time period covered by the report.
E. Drivers on Maryland highways exceeded the speed limit more often than did drivers on other state highways not covered in the report.

我们可以先看一下这段话的意思：最近的一份报告确定，尽管马里兰州高速公路上只有3%的司机为他们的车辆配备了雷达探测器，但在所有因超速而被开罚单的车辆中，有33%的人配备了雷达探测器。显然，配备雷达探测器的司机比不配备雷达探测器的司机更有可能经常超速行驶。

逻辑链就是从3%和33%的关系→装探测器的司机更可能领到超速罚单。结合选项，A说与未安装雷达的司机相比，安装雷达的司机因超速而被开罚单的可能性较小，与结论不符。B因为超速而被开罚单的司机比没有开罚单的司机更有可能经常超速。搭桥增强，符合逻辑链，正确。C因超速被开罚单的车辆数量大于装有雷达的车辆数量。与题无关。D许多因超速而被开罚单的车辆在报告所涵盖的时间段内被开了不止一次罚单。与题无关。E马里兰州高速公路上的司机超过限速的频率比报告中未涉及的其他州高速公路上的司机要高。无关比较。

通过这个例子，我们可以看出，assumption 题就是要补充一个 necessary condition。所以在做题的时候我们首先需要找到原文中的前提和结论，提炼出前提和结论涉及的主要逻辑对象。锁定结论，根据选项答案，来分析它们和结论之间的本质联系。