下面主要为大家讲解的是GMAT逻辑演绎题的结构，主要包括两种结构。为了帮助大家理解这两种结构的展现形式，小编在后面列了例题，一定要仔细分析一下哦。
一、GMAT逻辑演绎题的理解
演绎题目文章通性：通常情况下，文章中仅仅叙述两件事情，两件事情是先后发生的因果关系，先发生的是原因，后发生的是结果。文章叙述的过程中会出现两种结构：先叙述前提原因，后叙述即将发生可能发生但是不一定发生的结论;或者先叙述已经发生的结果，后叙述导致该结果的原因。
读文章方式：读懂文章的推导过程。
(详情请看 GMAT逻辑演绎题简介 )
二、GMAT逻辑演绎题第一种文章类型
1、第一种文章(前提结论结构)：
先叙述一个先发生的前提原因，后叙述即将发生可能发生但是不一定发生的结论。文章特点：前提原因不足以推出结论，换句话说，仅有该前提，结论是不成立的。要想让结论成立的可能性提高，需要找寻附加前提。
2、文章中标志词：
since 前提原因 , 结果 ; if 前提原因 then 结果 ; by 手段 in order to 目的 ; plan 手段 to 目的 ……
3、形式展示：
1)Because no employee wants to be associated with bad news in the eyes of a superior, information about serious problems at lower levels is progressively softened and distorted as it goes up each step in the management hierarchy. The chief executive is, therefore, less well informed about problems at lower levels than are his or her subordinates at those levels.
2)A private bus company gained greater profits and provided bus service to the area at lower fares by running buses more frequently and stimulating greater rider-ship. Hoping to continue these financial trends, the company plans to replace all older buses with new, larger buses, including some double-decker buses.
3)When limitations were in effect on nuclear-arms testing, people tended to save more of their money, but when nuclear-arms testing increased, people tended to spend more of their money. The perceived threat of nuclear catastrophe, therefore, decreases the willingness of people to postpone consumption for the sake of saving money.
三、GMAT逻辑演绎题第二种文章类型
1、第二种文章(果因结构)：
先叙述已经发生的结论结果，后叙述导致该结果的原因。
2、第二种文章的标志词：
文章中标志词： 结果 is due to 原因 ;
attribute 结果 to 原因 ;
结果 is result of 原因 ;
blame 原因 for 结果 ;
原因 is responsible for 结果 ;
问题中标志词：explanation, interpretation, hypothesis.
3、形式展示：
1)Studies in restaurants show that the tips left by customers who pay their bill in cash tend to be larger when the bill is presented on a tray that bears a credit-card logo. Consumer psychologists hypothesize that simply seeing a credit-card logo makes many credit-card holders willing to spend more because it reminds them that their spending power exceeds the cash they have immediately available.
2)The recent decline in numbers of the Tennessee warbler, a North American songbird that migrates each fall to coffee plantations in South America, is due to the elimination of the dense tree cover that formerly was a feature of most South American coffee plantations.
3)The number of people diagnosed as having a certain intestinal disease has dropped significantly in a rural county this year, as compared to last year. Health officials attribute this decrease entirely to improved sanitary conditions at water-treatment plants, which made for cleaner water this year and thus reduced the incidence of the disease.
4)The town of Stavanger, Norway, was quiet and peaceful until early 1960’s, when Stavanger became Norway’s center for offshore oil exploration. Between then and now, violent crime and vandalism in Stavanger have greatly increased. Clearly, these social problems are among the results of Stavanger’s oil boom.
(详情请看 GMAT逻辑演绎题的结构 )
GMAT逻辑演绎题的简单概念和结构介绍小编就为大家展示完毕了，演绎题的结构比较特别，并且四种演绎题都具备这样的结构，大家在阅读逻辑题干时可以关注一下。
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