英语阅读中逻辑关系词的详细解析
关于逻辑关系词在阅读中的作用，我们首先来看一段文字：
the discourse markers signal relationships: between different parts of thediscourse … the main reason for studying them is their usefulness in helping thereader to work out the meaning of difficult text. They often show therelationship the writer intends between two parts of the text, so if you canunderstand one part, the discourse marker is a possible key to the other part.(Christine Nuttall, 1996. Teaching Reading Skills in a Foreign Language,Heinemann)
关于“discourse marker”，P.H.Matthews在其Oxford Concise Dictionary of Linguistics(Oxford University Press) 一书中是这样描述的：Any of a variety of units whose function iswithin a larger discourse rather than an individual sentence or clause: e.g. butthen in But then he might be late. “discoursemarker”虽然范围更加广泛一些，但从以上文字不难看出，它包括了我们所熟悉的逻辑关系词(即文章中用于表示并列，转折，举例，因果，递进，让步，总结等逻辑关系的固定单词或词组)。也由此可见，特别重视形式逻辑和思维分析的英语行文，在词语之间和句子之间往往会借助各种逻辑关系词清楚表达思维逻辑和语意关系。因此了解和掌握逻辑关系词可以帮助我们把握文章中语意的转换和发展，理解文章重点表达的意思。
具体到雅思阅读，逻辑关系词在解题中体现出两大功能 ：
一、语意推断
语意推断主要是运用于重点题型之一的摘要题(Summary)。具体是指根据空格所在句及前后句的逻辑关系词，分析词语之间，句子之间的语意关系，推断出所缺单词的`大致含义。
例如：
1.剑4 / P77 / Q38
Some corpora include a wide range of language while others are used tofocus on a particular linguistic feature.
根据while这个表示对比或转折的逻辑关系词，可以判断它前后部分是对比或反义关系。“a wide range oflanguage”指的是语言研究的广泛的各个方面，可以预判空格处应是指具体的方面。
2.剑1 / P20 / Q4-5
The very first fire-lighting methods involved the creation of friction by,for example, rapidly rotating a wooden stick in a round hole.
根据介词“by”和“for example”这个表示举例的逻辑关系词，可以预判第二个空格应是和“creation offriction”(产生摩擦)的具体动作有关的词。
3.剑1 / P20 / Q6
The use of percussion or persistent chipping was also widespread in Europe…
根据表示并列的逻辑关系词or，可以判断它前后部分是并列关系。Chipping是“削，凿”的意思，可以预判空格处应是类似意思的词。
二、定位
根据对历年真题的总结分析，雅思阅读考试的一个重要规律是：题干中的句子之间，词语之间的逻辑关系在原文中一般不变(但表现方式可能会变)。这一规律使得逻辑关系词可以有效地协助题干关键词在原文中定位答案信息源。尤其在摘要题(Summary)中这一方法使用频率很高。
例如：
1.剑5 / P50 / Q30-31
题干：In Britain, moreover, scientists worried that English had neither thetechnical vocabulary nor the grammatical resources to express their ideas.
原文：First, it lacked the necessary technical vocabulary. Second, it lackedthe grammatical resources required to represent the world … (Para.7)
题干中出现的neither…nor…是连接两个否定概念的并列逻辑关系词。原文中对应出现了完全相同的逻辑关系，即first, it lacked …,second it lacked …(表现方式有所变化)。我们可根据这种对应的逻辑关系在原文中快速定位答案信息源。
2.剑5 / P50 / Q33-34
题干：Although English was then overtaken by German, it developed again in the19th century as a direct result of the industrial revolution.
原文：In the following century much of this momentum was lost as Germanestablished itself as the leading European language of science. … However, inthe 19th century scientific English again enjoyed substantial lexical growth asthe industrial revolution created the need for new technical vocabulary.
题干中出现的两种逻辑关系均在原文中对应出现。一是表示转折关系的although, 对应于原文中的however;二是表示因果关系的as adirect result of 对应于原文中表因果的逻辑关系词as。很显然，这对于题干信息的定位意义重大。
3.剑5 / P70 / Q25-26
题干：To deal with this, Stanley suggests the use of artificial floods in theshort term, and increasing the amount of water available through desalination inthe longer term.
原文：In the immediate future, Stanley believes that one solution would be tomake artificial floods to flush out the delta waterways, in the same way thatnatural floods did before the construction of the dams. He says, however, thatin the long term an alternative process such as desalination may have to be usedto increase the amount of water available.
题干中出现了表示递进的逻辑关系词in the short term … in the longer term…。快速查读原文，可定位于文中相同的逻辑结构in the immediate future … in the long term …。
另外，对雅思真题文章进行精读训练的同学会发现，除了以上两大功能之外，逻辑关系词在原文中的位置还常常是命题考点最集中的地方。因此学习和掌握逻辑关系词在阅读中的功能和作用，将对提高答题的速度起关键性的作用。同时，能够熟练运用逻辑关系词对于写出条理清楚，层次分明的雅思作文也大有帮助。
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