例三：
Directions: Choose the main idea of an article. (Following are the topic sentences of an article.)
1) A mounting body of evidence suggests that fighting violence with violence rarely deters a crime in progress and greatly increases the chances of changing a robbery into a violent attack on the victim.
2) One report shows that at least 100 thousand handguns are stolen from private owners each year, the vast majority during burglaries...
3) Moreover. a study of robberies in eight American cities states that in less than 4 percent of the crimes did the victim have the opportunity to use a weapon....
Which of the following best reflects the main idea of the article?
(A) What Happens to the Victim of Crime?
(B) Is Your Family Safe?
(C) Should You Arm Yourself Against Crime?
第一段和第三段提到了victims(受害者)，第二段中提到了入室行窃，但是这三段说明的共同问题是人们是否应拥有自己的武器来反对犯罪行为 。因此只有选择(C)才能概括这三段所共同说明的问题，也就是此文的中心思想 。
二、主题思想应能恰如其分地概括文中所阐述的内容 。面不能太窄，即：不足以概括全部内容;但是面也不能太宽，即：包含了文中没有阐述的内容 。
例四：
Directions: Read the following passage and choose the best central thought
Sugar history in the Hawaiian Islands is filled with pioneering. In sailing ship days, Hawaiian sugar growers were many months from sources of supplies and from markets. This isolation built up among the Hawaiian growers an enduring spirit of cooperation. Growers shared with one another improvements in production. Without government aid of any sort, they built great irrigation projects. Without government help, they set up their own research and experiment organization. Pioneering together over the years, they have provided Hawaii with its largest industry.
(A) In sailing days, Hawaiian sugar growers were many months away from supplies and markets.
(B) Hawaiian sugar growers built their great industry without government help.
(C) Hawaiian sugar growers have set up their own research organization and have shared improvements.
(D) By pioneering together, sugar growers have provided Hawaii with its largest industry.
(A)，(B)和(C)项只是文中提到的各项具体内容，作为主题思想面太窄了，只有(D)项才概括了全文要说明的问题，因此，(D)是该文的主题思想 。
要求抓主题思想的另一种形式是为短文选择合适的标题，因为短文的标题常常也体现它所围绕的主题或讨论的中心 。因此，为短文选择标题实际上也反映了对主题思想的掌握 。
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
该问题中，(A)泛指经济规律，面过宽;(C)和(D)只是供需规则的二个单独的方面不能包含全部，面太窄 。正确的答案是(B)，因为这正是该短文自始至终谈论的主题 。
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.

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