A．Economic Principles

B．Law of Supply and Demand

C．M ore Goods，Lower Prices

D．Fewer Goods，Higher Prices

該問題，A泛指經(jīng)濟規(guī)律，面過寬；C和D只是供需規(guī)則的二個單獨的方面，不能包含全部，面太窄。正確的答案是B，因為這正是該短文自始至終談論的主題。

三、一段文章的中心思想常常由主題句（Topic Sentence）表達。主題句常常位于段首或段尾處，間或出現(xiàn)在段落中間。同樣，一篇文章的中心思想也常常在開始或結(jié)尾段點出。因此在閱讀中，我們要特別注意文章的開頭或結(jié)尾。例四：

English is clearly an international language．It is spoken by pilots and airport control operators on all the airways of the world．Over 70 percent of the world's radio programs are in English．

本段主題句為首句，其后的內(nèi)容句均說明首句。例五：

Some students prefer a strict teacher who tells them exactly what to do．Others prefer to be left to work on their own．Still others like a democratic discussion type of class．No one teaching method can be devised to satisfy all students at the same time．

本段中心思想在結(jié)尾句得到體現(xiàn)，它是此段內(nèi)容的結(jié)論。例六：

For adults a cold is not that serious．However，this is not the case for children．Cold symptoms in children may be signs of more serious diseases and should be given prompt medical attention．

本段主題句為第二句，因為在however后面才是作者真正的看法，并在下文中進一步作了說明。

然而，我們也常常發(fā)現(xiàn)，有的主題思想并非直接由一、二個句子表述，而是在文中間接暗示著。這就需要讀者根據(jù)文中細節(jié)進行概括與歸納，找出主題思想。例七：

It's no wonder that we have so many rejections for physical reasons in our Selective Service．Since October of 1948，some six million young men have been examined for military duty．Of these，more than a million were rejected as physically unfit for military service．To get two men today，the United States Army must call seven men．Of the five rejected three are turned down for physical reasons and two for mental problems．To get the 196thousand additional men we needed for Berlin，the government had to call up 750 thousand men．And the rejection rate is increasing each year．The reason for this problem is that we are underexercised as a nation．We look，instead of play．We ride，instead of walk．The way we live prevents us from being healthy．

本段中找不到某一句作為主題。根據(jù)文中的內(nèi)容進行歸納，可找出主題思想，即：“The military's rejection rate for physical reason is increasing because this nation's lack of exercise is leading to poor health．”

在確定一篇文章的中心思想時，我們通常用快讀的方法，從頭至尾將全文瀏覽一遍，注意不要被個別詞、句難住而停下來。要從上下文的連貫意思上來理解全文，看看全文談論的是什么主題（Subject）、作者是從哪幾個方面（Aspects）來進行闡述的、有關(guān)這個主題我們了解了些什么。這樣，就可以比較有把握地概括出中心思想了。

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