模式二：

　　第一部分：開頭提出一個(gè)概念、一個(gè)中心思想或者一種現(xiàn)象；

　　第二部分：圍繞著這個(gè)概念、中心思想或者現(xiàn)象，從各個(gè)方面進(jìn)行分析和解釋說明，這種文章比較容易定位其主旨；

　　第三部分：對(duì)文章進(jìn)行總結(jié)，并再一次對(duì)該概念、中心思想進(jìn)行闡述，或?qū)ο嚓P(guān)現(xiàn)象進(jìn)行說明。

　　例文：2000年P(guān)assage 5

　　If ambition is to be well regarded, the rewards of ambition health, distinction, control over one's destiny must be deemed worthy of the sacrifices made on ambition's behalf. If the tradition of ambition is to have vitality, it must be widely shared; and it especially must be highly regarded by people who are themselves admired, the educated not least among them. In an odd way, However, it is the educated who have claimed to have give up on have give up on ambition as an ideal. What is odd is that they have perhaps most benefited from ambition-if not always their own the that of their parents and grandparents. There is heavy note of hypocrisy in this, a case of closing the barn door after the horses have escaped with the educated themselves riding on them.

　　Certainly people do not seem less interested in success and its signs now than formerly. Summer homes, European travel, BMWs. The locations, place names and name brands may change, but such items do not seem less in demand today than a decade or two years ago. What has happened is that people cannot confess fully to their dreams, as easily and openly as once they could, lest they be thought pushing, acquisitive and vulgar. Instead, we are treated to fine hypocritical spectacles, which now more than ever seem in ample supply: the critic of American materialism with a Southampton summer home; the publisher of radical books who takes his meals in three-star restaurants; the journalist advocating participatory democracy in all phases of life, whose own children are enrolled in private schools. For such people and many more perhaps not so exceptional, the proper formulation is, Succeed at all costs but avoid appearing ambitious.

　　The attacks on ambition are many and come from various angles; its public defenders are few and unimpressive, where they are not extremely unattractive. As a result, the support for ambition as a healthy impulse, a quality to be admired and fixed in the mind of the young, is probably lower than it has ever been in the United States. This does not mean that ambition is at an end, that people no longer feel its stirrings and promptings, but only that, no longer openly honored, it is less openly underground, or made sly. Such, then, is the way things stand: on the left angry critics, on the right stupid supporters, and in the middle, as usual, the majority of earnest people trying to get on in life.

　　這篇文章主要圍繞著地質(zhì)活動(dòng)的熱點(diǎn)（hot pot）理論這個(gè)概念進(jìn)行討論。