例五：

　　Directions: Read the following and choose the title that best expresses the ideas of the passage.

　　There is a simple economic principle used to determine prices. It is called the law of supply and demand. Supply means the amount of, or access to, certain goods. Demand represents the number of people who want those goods. If there are more goods than wanted, the price of them falls. On the other hand, if the demand for those goods is much greater than the supply, then the price rises. Of course, manufacturers prefer to sell more goods at increased prices.

　　(A) Economic Principles

　　(B) Law of Supply and Demand

　　(C) More Goods, Lower Prices

　　(D) Fewer Goods, Higher Prices

　　該問(wèn)題中，(A)泛指經(jīng)濟(jì)規(guī)律，面過(guò)寬;(C)和(D)只是供需規(guī)則的二個(gè)單獨(dú)的方面不能包含全部，面太窄。正確的答案是(B)，因?yàn)檫@正是該短文自始至終談?wù)摰闹黝}。

　　例六：

　　Directions: Read the following passage and select the most appropriate title:

　　According to legend, the gods of the ancient Greeks lived in the clouds on the top of Mount Olympus. Zeus, the father of the gods, carried a bolt of lightning in his hand and ruled like an earthly king. Apollo was the sun god and his beams were golden arrows; he shielded the flocks of sheep and the fields of grain. Athena was the warrior goddess, standing in shining armor ready to protect the Greek cities. There were other gods as well, all with familiar human characteristics, but these were the leading gods.

　　(A) The Gods of the Ancient Greeks

　　(B) The Legend of the Sky God Zeus

　　(C) Beliefs of the Ancient Greeks

　　(D) Religions of the Past

　　該問(wèn)題中，(B)項(xiàng)只是文中提到的一項(xiàng)具體內(nèi)容，作為主題思想面太窄了。(C)和(D)項(xiàng)泛指，面太寬。只有(A)項(xiàng)才概括了全文要說(shuō)明的問(wèn)題，是全文的主題。

　　三、一段文章的中心思想常常由主題句(Topic Sentence)表達(dá)。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(kāi)始段或結(jié)尾段點(diǎn)出。因此在閱讀中，我們要特別注意文章的開(kāi)頭或結(jié)尾。

　　例七：

　　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)容均說(shuō)明首句。

　　例八：

　　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。

　　例九：

　　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?yàn)樵趆owever后面才是作者真正的看法，并在本文中進(jìn)一步作了說(shuō)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(gè)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(xì)節(jié)進(jìn)行概括與歸納，找出主題思想。

　　例十：

　　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 196 thousand 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 under exercised 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(jìn)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(shí)，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(gè)別詞、句難住而停下來(lái)。要從上下文的連貫意思上來(lái)理解進(jìn)行闡述的、有關(guān)這個(gè)主題我們了解了什么。這樣，就可以比較有把握地概括出中心思想了。

　　在閱讀理解測(cè)試中，常常用于檢查對(duì)主題思想的掌握的問(wèn)題有：

　　1. The main (central, principal) idea of this passage is __________________ .

　　2. The main idea of this selection may be best expressed as __________________.

　　3. The main theme (topic) of the passage is __________________ .

　　4. The passage is mainly about __________________ .

　　5. This passage deals mainly (primarily) with __________________ .

　　6. The author's purpose in writing this passage is __________________ .

　　7. The main purpose of the passage is __________________ .

　　8. The best (most appropriate) title of (for) this passage is __________________ .

　　9. What would be the most appropriate title for this passage?

　　10. What is the subject of this passage?

　　11. Which of the following best summarizes the passage?

　　12. Which of the following best sums up the main idea of the whole passage?

　　建議大家在平時(shí)的閱讀練習(xí)中進(jìn)行全文快速瀏覽，嘗試自己提煉和總結(jié)文章主旨。經(jīng)過(guò)一段時(shí)間的練習(xí)，考試中必然能快速了解整篇文章大意，方便選出正確答案。