所谓一个中心主要包含两个方面：
一、一篇文章有一个中心，全文均是围绕文章中心展开。
阅读理解中，广大考生首先面临的难题之一，就是如何在读完文章之后，有效地提炼出文章的中心。其实提炼中心的方法早在我们中学学习语文的时候，老师已 经教给我们。文章中心可以概括为一句或者几句话。有的文章在一开始就会开门见山提出文章的中心。有的文章第一段进行背景介绍，进而在第二段提出文章中心。 但是，有的文章也需要考生读完之后，自己通过对各段叠加，概括出文章的中心思想。如果考生读完文章之后，仍然无法提炼出文章的中心，那么一定要找出反映文 章中心思想的词语(或词组)，即所谓的核心词。这个核心词往往会在每个段落反复提到，以名词居多。
★阅读小贴士：注意高频词汇或词组。有些时候，高频词汇或词组以不同的形式出现，它们很可能是本篇短文的中心或关键问题或事物。
【例如】The world is going through the biggest wave of mergers and acquisitions ever witnessed. The process sweeps from hyperactive America to Europe and reaches the emerging countries with unsurpassed might. Many in these countries are looking at this process and worrying: Wont the wave of business concentration turn into an uncontrollable anticompetitive force?
通过略读我们可以发现文章的中心词/词组为the biggest wave of mergers and acquisitions, the process, this process, the wave of business concentration.文章顿时变得一目了然。
二、一个段落会有一个中心
英语文章段落会有严格的成分构成。一般说来，英语的一个段落由三部分构成：主题句+扩展句+结尾句
1、所谓主题句是指一个段落的中心思想句，往往位于句首。
2、所谓扩展句是指解释、论证、说明主题句的句子，最为明显的标志词如for example, for instance等。
3、所谓结尾句是指总结陈述主题句的句子，往往可以省略。因此，读文章的过程中，每个段落的首末句要放慢速度，尤其是首句一定要放慢速度。当然任何规则也都会有例外。有些时候，文章段落不会出现主题句，需要读者自己去提炼。
【例如】Consumers say theyre not in despair because, despite the dreadful headlines, their own fortunes still feel pretty good. Home prices are holding steady in most regions. In Manhattan, theres a new gold rush happening in the $4 million to $10 million range, predominantly fed by Wall Street bonuses, says broker Barbara Corcoran. In San Francisco, prices are still rising even as frenzied overbidding quiets. Instead of 20 to 30 offers, now maybe you only get two or three, say John Deadly, a Bay Area real-estate broker. And most folks still feel pretty comfortable about their ability to find and keep a job.
很明显In Manhattan,----和In San Francisco,----这两句话构成了对Home prices are holding steady in most regions.这句话的解释，通过两个城市房价的变化，来论证说明为什么房价在许多地区仍然比较稳定。所以我们也就不难做出下面的题目。
53. When mentioning the $4 million to $10 million range (lines 3-4, paragraph 3) the author is talking about .
A. gold market
B. real estate
C. stock exchange
D. venture investment
★阅读小贴士：注意路标词即过渡词。路标词或词组，可以帮助考生有效理解作者思想的具体衔接和转折过渡等，从而有效把握前后句之间的关系。
最常见的过渡词有：
1、此外besides=moreover=furthermore=in addition
2、更重要的是more than that; 同样重要的是equally important; 更more/less
3、而且/并且and; 而且，也also
4、表先后顺序：first, second/next
5、同样： likewise; 或者alternatively
6、因此，表因果so=therefore=thus=consequently=accordingly=as a result=and so
7、总而言之，表结论as a result=finally=above all=after all=concluding=hence=to sum up=in conclusion
8、但是;表转折but= yet= however= on the other hand= while= nonetheless= nevertheless= otherwise
尽管although= though= despite= instead= in spite of= on the contrary= notwithstanding= rather= in contrast
9、表空间位置near, far, beside, next to, above, under, behind, in front of, across, on the side of
10、表目的for this purpose, so that, in order to
11、表强调in fact, indeed, surely, certainly, to be sure, I am certain
12、表举例for example= for instance= such as= specifically= to be specific= in particular= to illustrate this= thus
13、表条件in that case, that being so, in these circumstances, if, unless, otherwise。
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