GMAT写作备考中应该避免哪些常见逻辑错误？.

　　很多同学都在准备GMAT考试，其中GMAT写作是同学们很难复习的一点。备考GMAT写作最重要的还是要减少逻辑方面的错误，下面澳际小编就为大家介绍一下GMAT写作常犯的逻辑错误有哪些，希望对大家有帮助。

　　non-causal relationship

　　非因果关系逻辑错误。

　　1、correlation mistaken for causasion将相关性当做因果关系: the argument depends on an umprovencause-and-fect relationship between...and...The reason for ...mighthave nothing to do with either,,,or ,,,For instance..For that matter...Withoutruling out these and other alternative explanations for... the author cannotreasonably conclude that... will have any fect on that cause(for that matter:used to add a comment on sth that you have just said eg: Ididn't like it much.Nor did the kids, for that matter.)

　　2、 post hoc ergo propter hoc后此谬误: The authorassumes that... cause...The line of reasoning is that because...bore..., thormer event caused the latter. But this is fallacious reasoningunless other possible causal explanations have been considered and ruled out.For example, perhaps...Or perhaps... Yet another possibility is that...

　　3 、confuse the cause and fect混淆因果关系：It is possiblethat the mayor has confused cause with fectrespecting...Perhaps...Since...has failed to account for this possibility, theclaim that...is completely umfounded. Some other possible causes of... alsoshould not be ignored. Without ruling out these and other alternativeexplanations for... cannot reasonably infer based on those trends that...

　　4、causal oversimplification因果关系简化。

　　the fallacy of analogy and comparison

　　比较与类比逻辑错误。

　　1、 the fallacy of faulty analogy错误类比：It is highlydoubtful that the facts drawn from..are applicable to...Differeces betwee thetwo industries clearly outweigh the similarities, thus making the analogy lessthan valid. For example, problems of... all affect...but are virtually absentin...Perhaps such these might present insurmountable obstaclesthat prevent.... (insurmountable: of difficulties, problems, that cannt bedealt with successfully)。

　　2、incomplete or sellective comparison不完整比较或选择性比较： The argument wasbased on the assumption that...However, we are not given enough informationabout the study to be sure that this comparison is reliable.

　　problems concerning data

　　数据相关逻辑错误。

　　1、 the insufficient sample fallacy 不充分采样错误：

　　(1)样本作为整体的一个部分必须具有足够大的数量the conclusionthat...is based on too small a sample to be reliable;

　　(2)样本在相关的特性方面必须具有整体的代表性 the only evidenceoffered in support of this conclusion is the fact that...Unless it can be shownthat... is typical of all... thae fact that... is not grounds for concludingtaht... will experience similar results/ the example cited, while suggestiveof... is insufficient to warrant their truth because there is no reason tobelieve that data draw from... is representative of the entire...

　　2、the biased-sample fallacy有偏采样错误：the survey methodology might beproblematic in two respects.

　　(1)对调查的答复必须是可信的、真实的、准确的，需要参与调查的人保证不因为某些原因而给出不完整或者虚假的回复;

　　(2)收集数据的方法必须公正，要避免在调查中，对问题的回答不做硬性要求，或者问题的设计使得参与者易于用某种特定的回答方式 in either event,the survey results would be unreliable for the purpose of drawing anyconclusions about...let alone about...

　　(a)who conducted the survey? -the poll cited by the author isdescribed in the vaguest possible terms. The ad does not indicate who conductedthe poll, who respond, or how the poll was conducted. Unless these questionsare answered, the survey results are worthless as evidence for public opinionabout...

　　(b)are the statistics misleadingly vague?

　　(c)when was the survey conducted?

　　sufficient evidence and necessary condition

　　充分条件与必要条件逻辑错误。

　　1、 sufficient-condition problems 充分条件问题。

　　2、necessary-condision problems 必要条件问题。

　　3、sufficient and necessary conditionproblems 充要条件问题 In order todo A, B should do C...只有B做C，A才能实现;只要B做了C，A就一定能实现。

　　composition and division

　　整体与部分逻辑错误。

　　1、what is true for a group is also true forany member 适用与整体的原则也适用于整体的任一个个体 while thisreasoing may be sound in a generl sense, the particular XXX involved in may notbe representative of XXX generally.

　　2、what is true for a member is also true forthe group 对某个个体适用的东西对整体也适用 the most egregiousreasoning error in... is ....in this region as the basis for a generalizationabout all...

　　3、the fallacy of hastygeneralization/neglect of relevant evidence从几个个体所具有的某个特性推出整体也具有这个特性(急于概括)。

　　assuming aa things remain unchanged overtime

　　假定所有的事情都是一成不变类逻辑错误。

　　1、past conditions remain unchanged in thepresent and future 过去的情况在今天和将来都保持不变 however, a recentone-year increase is insufficient evidence itself to convince me that thistrend will continue。

　　2、 present conditons will remain unchanged inthe future 目前情况在将来保持不变 the argumentassumes that relative supply conditions will remain unchanged over the next 20years. However...may fluctuate greatly over a long time period...Withoutconsidering other factors that contribute to...the firm cannot justify itsrecommendation.

　　false dilemma/ either-or thinking/ the black-white fallacy

　　错误的两难境地类逻辑错误。

　　the author assumes that reducing XXX and XXX are mutuallyexclusive alternatives. However, the author provides no reason for imposing aneither-or choice.

　　其他逻辑错误

　　1、 failing to weighing the advantages anddisavantages thoroughly 考虑问题不全面。

　　2、 failing to dine important terms 没有限定重要词语。

　　3、 circular reasoning / tautology/ beggingthe question 循环论证: 在原题论述中，如果发现有重要假设没有任何论据支持，就可以就其循环论证的逻辑缺陷展开攻击。

　　4、drawing a conclusion that is too board indegree or scope 得出的结论在程度或范围上过于广泛。

　　5、relying on vague or ambiguous evidence 依赖于模棱两可的证据：要注意留意原论述中用some, many,several来代替具体的百分比或数字的地方。

　　6、 arguing simultaneously for two competingobjectives 同时为两个相对立的目标辩论：在某些文章中，作者有时会试图同时为两个看起来相互对立的目标辩论，换句话说，如果作者想完成其中的一个目标，就会减小完成另一个目标的可能性。

　　7、 irrational appeals 无理呼吁：包括诉诸于权威或情感。

　　8、 ad hominem/ personal attack人身攻击。

　　9、straw argument 稻草人：树立一个易被攻击的靶子，忽略真正的问题;或者强加一个作者没有提及的易被攻击的问题。

　　10、false or questionable authority 错误权威。

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