模式四：

　　第一部分：提出一个现存的需要解决问题；

　　第二部分：分析问题产生的原因，存在的因素以及可能的解决方案，作者可能提到几个不同的解决方案，但是之后作者自己认可的那种方案才是文章的重点和主题

　　第三部分：对问题进行总结说明并进一步强调作者支持的那种解决办法。

　　例文：1999年Passage 2

　　In the first year or so of Web business, most of the action has revolved around efforts to tap the consumer market. More recently, as the Web proved to be more than a fashion, 考博信息网panies have started to buy and sell products and services with one another. Such business-to-business sales make sense because businesspeople typically know what product they''re looking for.

　　No考博信息网heless, many 考博信息网panies still hesitate to use the Web because of doubts about its reliability. Businesses need to feel they can trust the pathway between them and the supplier, says senior analyst Blane Erwin of Forrester Research. Some 考博信息网panies are limiting the risk by conducting online transactions only with established business partners who are given access to the 考博信息网pany's private inter考博信息网.

　　Another major shift in the model for Inter考博信息网 考博信息网merce concerns the technology available for marketing. Until recently, Inter考博信息网 marketing activities have focused on strategies to pull customers into sites. In the past year, however, software 考博信息网panies have developed tools that allow 考博信息网panies to push information directly out to consumers, transmitting marketing messages directly to targeted customers.

　　Most notably, the Pointcast Network uses a screen saver to deliver a continually updated stream of news and advertisements to subscribers' 考博信息网puter monitors. Subscribers can customize the information they want to receive and proceed directly to a 考博信息网pany's Web site. Companies such as Virtual Vineyards are already starting to use similar technologies to push messages to customers about special sales, product offerings, or other events. But push technology has earned the contempt of many Web users. Online culture thinks highly of the notion that the information flowing onto the screen 考博信息网es there by specific request. Once 考博信息网mercial promotion begins to fill the screen uninvited, the distinction between the Web and television fades. That's a prospect that horrifies Net purists.

　　But it is hardly inevitable that 考博信息网panies on the Web will need to resort to push strategies to make money. The examples of Virtual Vineyards, Amazon.考博信息网, and other pioneers show that a Web site selling the right kind of products with the right mix of interactivity, hospitality, and security will attract online customers. And the cost of 考博信息网puting power continues to free fall, which is a good sign for any enterprise setting up shop in silicon. People looking back 5or10 years from now may well wonder why so few 考博信息网panies took the online plunge.