GMAT逻辑按文章类型分类解题是一种非常实用的方法，也许大家还不太清楚，今天前程百利小编就从文章分类的角度为大家讲解一下解题突破点。
一、GMAT逻辑三种文章类型分类
GMAT逻辑的每道题剔除各种背景信息，提炼出简化的逻辑链，然后依照逻辑链的种类可分为四种类型：
1、事实推理型：推理→事实型(文章给出已有的事实，推断导致该事实的原因);事实→推理型(文章给出已有的事实，推断事实导致的结果)。
2、措施→目的型(为了达到一目的，建议采用某个措施)。
3、AB对比型(A比B好，A比B经济，etc.)。
(详情参考 GMAT逻辑文章结构
http://gmat.bailiedu.com/cr/20151107/56818.html )
二、GMAT逻辑三种文章类型的解题突破点
将每题正确答案分别写在逻辑链下，看它是从逻辑链哪个环节切入达到削弱/加强/评价/假设的目的。最后归纳总结不同类型逻辑链所对应的解题突破点如下：
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|
措施→目的型 |
事实推理型 |
AB对比型 |
|
削弱类 |
有其他因素阻碍目的达成 |
①A事实，B推理：直接推翻B |
缩小AB的差距 |
|
②A推理，B事实：他因导致 |
|||
|
加强类 |
与措施结合更能促使目的达成 |
①排除他因（weak point) |
扩大AB的差距 |
|
②举与事实平行例子支持结论 |
|||
|
评价类 |
有无其他因素阻碍目的达成 |
①A事实，B推理：与A相关 |
抓AB的本质区别 |
|
②A推理，B事实：有无他因导致 |
|||
|
假设类 |
①否定句②取非削弱 |
||
|
归纳题 |
①没有新信息 ②不加任何主观推理 |
||
(详情参考 GMAT逻辑题型讲解
http://gmat.bailiedu.com/cr/20151106/56797.html )
三、GMAT逻辑三种文章类型例题讲解
1、事实推理型
1)推理→事实型
Because it was long thought that few people would watch lengthy televised political messages, most televised political advertisements, like commercial advertisements, took the form of short messages. Last year, however, one candidate produced a half-hour-long advertisement. At the beginning of the half hour slot a substantial portion of the viewing public had tuned in to that station. Clearly, then, many more people are interested in lengthy televised political messages than was previously thought. (削弱)
逻辑链：更多的人对长广告感兴趣(推理)→有很大部分人将频道调回长广告(事实)。
答案：这个广告在精彩的电视节目时段播出。
削弱：他因导致。即：并非人们对长广告感兴趣，而是因为精彩的电视节目才调回频道。(攻击推理)
(详情参考 08prep-CR1第93题
2)事实→推论型
Many people suffer an allergic reaction to sulfites, including those that are commonly added to wine as preservatives. However , since there are several winemakers producing wine to which no sulfites are added, those who would like to drink wine but are allergic to sulfites can drink these wines without risking an allergic reaction to sulfites. (削弱题)
逻辑链：一些酒没加硫磺(事实)→对硫磺过敏的人可以喝这种酒(推理)
答案：酒中自然产生硫磺
削弱：直接推翻结论。即：就算没有人为加硫磺，酒里也有可能有硫磺，所以喝这种酒还是有可能过敏，直接推翻结论。(攻击推理)
解题技巧：选项永远都不能质疑已定事实，只能在推理上做文章。
(详情参考 08prep-CR2第83题
2、措施→目的型
Editor: Articles in Gardening Magazine often spur sales of the plants they describe, particularly among people new to gardening. Accordingly, we will no longer publish articles or accept advertisements praising the beauty of rare wildflowers. Most such plants sold to gardeners have been difficult to propagate under cultivation, so plant sellers often collect them in the wild. Our new policy is part of our efforts to halt this yearly plundering of our native plant populations. (削弱题)
逻辑链：不刊登稀有野花的文章(措施)→阻止野花的数量的减少(目的)。
答案：卖植物的钱用来研究廉价的给野花授粉技术。
削弱：其他因素阻碍目的达成。即：不刊登这类文章就没有卖植物的钱，也就失去授粉技术的资金，野花的数量还是会减少。
解题技巧：措施目的型的前提都是假设措施已实施!
(详情参考 08prep-CR2第92题
3、AB对比型
AB对比型 (prep2-103)
Electronic computer chips made of tiny silicon wafers now regularly contain millions of electronic switches. Unfortunately, electronic switches that are this small cannot withstand intense radiation. Micro-Mechanics plans to produce a chip that, because it uses only microscopic mechanical switches, will be invulnerable to radiation damage. The switches will, however, be slower than electronic switches and the chip will contain only 12,000 switches. There to be a market for Micro-Mechanics's chip as a result of the apparent advantage described above .(削弱题)
逻辑链：M-M芯片比E芯片速度慢且转换器少，但抗辐射→M-M会有市场(M-M芯片比E芯片好)。
答案：现在制造出的E芯片能抗辐射了。
削弱：缩小比较对象AB的差距。即：A的优势没有那么明显。
解题建议：缩小AB之间的差距的概念是指，A的优势没有那么明显，并不是B一定得比A好。
(详情参考 08prep-CR2第103题
通过以上的例题讲解不知道大家对这三类文章的解题方法有没有一定的了解呢?前程百利小编希望大家通过更多的练习体会其中的奥秘。最后，祝大家掌握更多技巧，取得好成绩。
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