第一段和第三段提到了victims（受害者），第二段提到了入室行竊，但是第三段說明的共同問題是人們是否應(yīng)擁有自衛(wèi)武器來反對(duì)犯罪行為。因此只有選項(xiàng)C才能概括這三段所共同說明的問題，也就是此文的中心思想。
二、主題思想應(yīng)能恰如其分地概括文中所闡述的內(nèi)容。面不能太窄，即：不足以概括全部內(nèi)容；但是面也不能太寬，即：包含了文中沒有闡述的內(nèi)容。例三：
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 sll more goods at increased price．
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(jì)規(guī)律，面過寬；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}。
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始或結(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?yàn)樵趆owever后面才是作者真正的看法，并在下文中進(jìn)一步作了說明。