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如何有效训练GMAT逻辑推理
GMAT逻辑题，也是历年GMAT考试的痼疾。都说GMAT逻辑题比其他部分都好拿分，原因是GMAT逻辑题只需对命题做出判断。实则不然，看上去简单的GMAT逻辑题实际上暗藏门道。它对GMAT逻辑推理的要求要高于平常的逻辑学习。为了便于考生进行复习，下面yjbys网小编就向大家介绍一下GMAT逻辑题的几个理解思路，以及如何更好地训练自己的GMAT逻辑推理能力。
1.如何正确理解weaken ， support
① 支持：(support)，将答案放在论据和结论之间，对原文推理或者结论有支持作用就可
以， 所以既可非充分又可非必要
② 驳斥：(weaken)，将答案放在论据和结论之间，对原文推理或者结论有驳斥作用就
可以， 所以也是既可非充分又可非必要
③ 如何理解充分和必要
1.充分：所谓充分条件就是仅有这条件就足以带来结果，不需考虑别的条件了。
它是谁成立，谁一定也成立，比如A→B， 如果A成立，那么一定有B
2.必要：所谓必要条件就是没有这个条件结果一定不对。
2.前因后果结构
推理中的前提和结论在大多数情况下用因果关系来表示，根据因果关系中的结果成立
不成立我们分为两种逻辑结构，前因后果结果和Causal Explanations结构，以后讲的答
案方向点区别并不大，但是我们为了利于理解进行这个分类
前因后果结构表示： (A——B)
从这个原因是否能够得到这个结果?(注意because， since， for等原因引导词 )
GMAT逻辑题的方法，不是一朝一夕就能熟悉和掌握的，为了在有限的时间内掌握一种最适合你的GMAT逻辑题解题技巧，就需要大家在平时的GMAT逻辑题复习中，不断培养自己的GMAT逻辑推理能力，考生千万不要小看GMAT逻辑推理能力，它还可以在其他部分的考试中发挥巨大威力。
通过上面对如何训练gmat逻辑推理能力的介绍，相信对于很多计划参加gmat考试的人来说，可以参考上述的方法和技巧来做好gmat逻辑推理的备考和训练。
【The Economist《经济学人》常用词汇】
91、长期(Long run)
长期是指所有投入品都是可变的时间期限。在长期中厂商可以全部改变它所使用的资源。
92、边际成本(Marginal cost)
边际成本是指由于增加最后一单位产量导致的总成本的增加。
93、边际成本定价(Marginal cost pricing)
边际成本定价是指这样一种定价规则，厂商或国有企业使得价格等于边际成本。
94、边际支出曲线(Manginal expenditure curve)
边际支出曲线表示厂商增加1单位投人品X所引起的成本的增加。
95、边际产品(Marginal product)
边际产品是指由于增加最后一单位某种投入品(其他投入品的数量保持不变)所带来的总产量的增加。
96、边际产品转换率(Marginal rate of product transformation)
边际产品转换率是指生产可能性曲线斜率的负数。
97、边际替代率(Marginal rate of substitution)
边际替代率是指如果消费者在收到额外一单位商品X之后要保持满足水平不变而必须放弃的商品Y的数量。
98、边际收益(Marginal revenue)
边际收益是指出售额外一单位产品所带来的总收益的增加。
99、边际收益产品(Marginal revenue product)
边际收益产品是指由于使用额外一单位投入品X所带来的总收益的增加。它等于投入X的边际产品乘以厂商的边际收益。
100、边际效用( Marginal utility)
边际效用是指(当所有其他的商品的消费水平保持不变时)从额外一单位商品中所获得额外满足(即效用)。
【GMAT写作范文】
19.The following appeared as part of an article in the travel section of a newspaper.“Over the past decade，the restaurant industry in the country of Spiessa has experienced unprecedented growth.This surge can be expected to continue in the coming years，fueled by recent social changes: personal incomes are rising，more leisure time is available，single-person households are more common，and people have a greater interest in gourmet food，as evidenced by a proliferation of publications on the subject.” Discuss how well reasoned...etc.
Recent social changes in the country of Spiessa lead the author to predict a continued surge in growth of that country's restaurant industry.Rising personal incomes，additional leisure time，an increase in single-person households，and greater interest in gourmet food are cited as the main reasons for this optimistic outlook.All of these factors are indeed relevant to growth in the restaurant industry; so the prediction appears reasonable on its face.However，three questionable assumptions operative in this argument bear close examination.
The first dubious assumption is that the supply of restaurants in Spiessa will continue to grow at the same rate as in the recent past.However，even in the most favorable conditions and the best of economic times there are just so many restaurants that a given population can accommodate and sustain.It is possible that the demand for restaurants has already been met by the unprecedented growth of the past decade，in which case the recent social changes will have little impact on the growth of the restaurant industry.
A second assumption is that the economic and social circumstances cited by the author will actually result in more people eating out at restaurants.This assumption is unwarranted，however.For example，increased leisure time may just as likely result in more people spending more time cooking gourmet meals in their own homes.Also，single people may actually be more likely than married people to eat at home than to go out for meals.Finally，people may choose to spend their additional income in other ways—on expensive cars，travel，or larger homes.
A third poor assumption is that，even assuming people in Spiessa will choose to spend more time and money eating out，no extrinsic factors will stifle this demand.This assumption is unwarranted.Any number of extrinsic factors—such as a downturn in the general economy or significant layoffs at Spiessa's largest businesses—may stall the current restaurant surge.Moreover，the argument fails to specify the “social changes” that have led to the current economic boom.If it turns out these changes are politically driven，then the surge may very well reverse if political power changes hands.
In conclusion，this argument unfairly assumes a predictable future course for both supply and demand.To strengthen the argument，the author must at the very least show that demand for new restaurants has not yet been exhausted，that Spiessa can accommodate new restaurants well into the future，and that the people of Spiessa actually want to eat out more.
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