高分文章要求句子結(jié)構(gòu)、句子類型、句子及段落的長短要有變化，這樣才能使文章富有節(jié)奏、生動、易理解。關(guān)于句子方面的內(nèi)容在上一章已詳述。這里只強調(diào)段落的變化。一般來講，英語文章包括三大段，第一段和最后一段是開頭和結(jié)尾段，篇幅較短，占全文的1/3左右，中間段是文章的主體段，篇幅較長，占全文的2/3左右。這樣寫出來的文章會錯落有致，富有變化感。此外，主體段按照具體的分論點可以分成相應(yīng)的自然段，一般由1-3個自然段組成，各段的長度可以大致相同，也可由短到長安排，即最后一自然段闡述或舉例最詳細。就文章長度不超過200字的大學英語四、六級考試作文而言，主體段一般寫一段即可。
主題句確立后，還要注意說明、解釋主題句的內(nèi)容是否與主題相符。統(tǒng)一性要求作者清楚地表達段落的主題思想；只提供與主題相關(guān)的信息及實例，其他再有趣的例子也應(yīng)該放棄不用?？傊?，一個段落只能有一個中心，段落中所有內(nèi)容都必須圍繞這一中心展開，給讀者一種整體感。
下面我們以 How to Succeed in a Job Interview?(2001.1 CET-4 & CET-6) 范文的第二段為例進行說明：
There are many factors involved. According to psychologists, it depends more on the first impression you leave which is half a battle: how you look, how you sound and what you say are of GREat importance. In the first place, how you look makes up 55% of a first impression. This includes facial expressions, body language, and eye contact, as well as clothing and general appearance. Among those, clothing is the most important to show your respect to the interviewer and to leave the interviewer a good impression in the end. In the second place, how you sound makes up 38% of the first impression. This includes how fast or slowly, loudly or softly you speak. So make sure that you sound friendly, interested, confident and happy in answering any inquires in the interview. Finally, what you say counts for only 7% of the message. Therefore, attach more importance to your appearance and expressions rather than your words.
本段在內(nèi)容上就具備了統(tǒng)一性。段落第一句表明下文要闡述影響面試成功的因素。第二句指出心理學家的觀點，面試成功與否取決于三個方面即 how you look, how you sound 和 what you say。緊接著文章圍繞這三點進行了詳細的解釋和說明。相反，如果段中加入面試途中發(fā)生的一件趣事就會使其中心內(nèi)容顯得雜亂無章。
主題句確立后，還要注意說明、解釋主題句的內(nèi)容是否與主題相符。統(tǒng)一性要求作者清楚地表達段落的主題思想；只提供與主題相關(guān)的信息及實例，其他再有趣的例子也應(yīng)該放棄不用?？傊?，一個段落只能有一個中心，段落中所有內(nèi)容都必須圍繞這一中心展開，給讀者一種整體感。
下面我們以 How to Succeed in a Job Interview?(2001.1 CET-4 & CET-6) 范文的第二段為例進行說明：
There are many factors involved. According to psychologists, it depends more on the first impression you leave which is half a battle: how you look, how you sound and what you say are of GREat importance. In the first place, how you look makes up 55% of a first impression. This includes facial expressions, body language, and eye contact, as well as clothing and general appearance. Among those, clothing is the most important to show your respect to the interviewer and to leave the interviewer a good impression in the end. In the second place, how you sound makes up 38% of the first impression. This includes how fast or slowly, loudly or softly you speak. So make sure that you sound friendly, interested, confident and happy in answering any inquires in the interview. Finally, what you say counts for only 7% of the message. Therefore, attach more importance to your appearance and expressions rather than your words.
本段在內(nèi)容上就具備了統(tǒng)一性。段落第一句表明下文要闡述影響面試成功的因素。第二句指出心理學家的觀點，面試成功與否取決于三個方面即 how you look, how you sound 和 what you say。緊接著文章圍繞這三點進行了詳細的解釋和說明。相反，如果段中加入面試途中發(fā)生的一件趣事就會使其中心內(nèi)容顯得雜亂無章。