成都GMAT暑假面授班哪家好 | 两道GMAT逻辑题看破assumption题型

例1：
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.
分析：“所有的车里有3%装雷达，超速被罚（ticketed for exceeding the speed limit ）的车里有33%装了雷达，换句话说前提是装雷达的司机更容易超速被罚，但结论说装雷达的司机更容易超速。”这里的logic gap：一个是超速被罚，一个是超速 ，这是两个概念。因此，简单搭桥就填补了这个gap，即“装雷达的司机更容易被罚+被罚的司机更可能超速=装雷达的司机更容易超速”，所以选B。
例2：
Researchers have found that when very overweight people, who tend to have relatively low metabolic rates, lose weight primarily through dieting, their metabolisms generally remain unchanged. They will thus burn significantly fewer calories at the new weight than do people whose weight is normally at that level. Such newly thin persons will, therefore, ultimately regain weight until their body size again matches their metabolic rate.
The conclusion of the argument above depends on which of the following assumptions?
(A) Relatively few very overweight people who have dieted down to a new weight tend to continue to consume substantially fewer calories than do people whose normal weight is at that level.
(B) The metabolisms of people who are usually not overweight are much more able to vary than the metabolisms of people who have been very overweight.
(C) The amount of calories that a person usually burns in a day is determined more by the amount that is consumed that day than by the current weight of the individual.
(D) Researchers have not yet determined whether the metabolic rates of formerly very overweight individuals can be accelerated by means of chemical agents.
(E) Because of the constancy of their metabolic rates, people who are at their usual weight normally have as much difficulty gaining weight as they do losing it.
分析：“研究者发现胖人往往新陈代谢慢，靠节食减肥，他们的新陈代谢一般不变。因此他们减肥后仍比正常人燃烧更少卡路里。因此这些人最终还会增肥直到体重和新陈代谢率相当。”前提是减下来后比正常人燃烧更少卡路里，结论就跳跃到最终会胖回去。很明显logic gap是还需要再多吃（虽然燃烧少了，但是如果不吃，至少能维持在减下来的体重呀）。填补上这个必要条件才能说明会胖回去。即“减肥后燃烧更少卡路里+大多数减肥后吃更多含卡路里的食物= 最终会打回原形”。（burn less + consume more = regain）因此就选A了。
通过这两道题，相信大家有点感觉了。万变不离其宗，大家只需明白一个道理：assumption题就是要补充一个necessary condition，因此不管是用“取非验证”还是“找logic gap”都能搞定。以上就是成都GMAT暑假面授的老师带来的讲解，希望以上分享对你有所帮助。