例2、One hundred and thirteen million Americans have　at least one bank-issued credit card. They give their　owners automatic credit in stores, restaurants, and　hotels, at home, across the country, and even abroad,　and they make many banking services available as well.　More and more of these credit cards can be read　automatically, making it possible to withdraw or　deposit money in scattered locations, whether or not　the local branch bank is open. For many of us the　“cashless society” is not on the horizon-it's　already here.
　　While computers offer these conveniences to consumers,　they have many advantages for sellers too.
      Electronic　cash registers can do much more than simply ring up　sales. They can keep a wide range of records,　including who sold what, when, and to whom. This　information allows businessmen to keep track of their　list of goods by showing which items are being sold　and how fast they are moving. Decisions to reorder or　return goods to suppliers can then be made. At the　same time these computers record which hours are　busiest and which employees are the most efficient,　allowing personnel and staffing assignments to be made　accordingly. And they also identify preferred　customers for promotional campaigns. Computers are　relied on by manufacturers for similar reasons.　Computer-analyzed marketing reports can help to decide which products to emphasize now, which to develop for　the future, and which to drop. Computers keep track of　goods in stock, of raw materials on hand, and even of　the production process itself.
      Numerous other commercial enterprises, from theaters　to magazine publishers, from gas and electric utilities to milk processors, bring better and more　efficient services to consumers through the use of　computers.

　　58. What is this passage mainly about? (1994)
　　(A) Approaches to the commercial use of computers.
　　(B) conveniences brought about by computers in　business.
　　(C) Significance of automation in commercial　enterprises.
　　(D) Advantages of credit cards in business.

　　解析：

　　第一步：判断本题目属于中心思想题；因此进入中心思想题的解题方法；

　　第二步：阅读文章首、末段首、末句4句话，使用剥洋葱式句子结构分析法得知这个4句话的意思(限于篇幅的原因我们就不一一翻译了)；翻译后我们发现，即使翻译为中文我们还是不知道文章的论点是什么。因此进入第2解题的思维：找最佳答案；

　　第三步：A的意思是电脑的商业使用的方法，文章在最后一段讲到了电脑的商业使用的问题，因此A是符合原文意思的；B的意思是商业中电脑带来的便利，原文讲到了B选项，明显的证明是bring　better and more efficient services to consumers　through the use of　computers，所以B也是正确并符合原文意思的；C的意思是自动化在商业企业中的重要性，文章4句话没有讲到自动化的问题，更没有讲到什么重要性，因此C是和原文无关的选项；D的意思是商业中信用卡的重要性，文章在第一段的第一句话就讲到了信用卡，但是没有讲到信用卡的重要性，因此D也是无关选项；因此这个题目的答案必然在A和B中产生。这个时候我们应该比较A和B有什么不同的地方。我们发现A强调的是“方法Approaches”而B强调的是“便利conveniences”，很显然文章着重讲解的是电脑带来的便利，因此这个题目应该选B；