怎樣寫好大學英語CET4作文
段落是文章的縮影。寫好了段落，就能比較成功地寫出較好的文章。經過中學英語基礎階段的學習之后，大學英語的寫作重點就從選詞造句轉移到了聯句成段和聯段成篇上。進行段落層次上的寫作訓練，是寫好英語文章的關鍵一環。下面介紹的是段落結構。
段落（ paragraph ）是由表達單一中心思想（controlling idea or central idea ）的一組句子（包括主題句 topic sentence,推展句supporting sentences及結論句concluding sentence）構成，是文章結構的基本獨立單位。本講我們將就主題句和中心思想這兩個方面進行討論。
1. 主題句（topic sentence）是表達段落主題的句子。它用以概括段落大意，要求全段其他文字都圍繞它展開。請看下例：
My mother has passed along to me certain rules for getting along with others. Don't argue with parents; they will think you don't love them. Don't argue with children; they will think themselves victimized. Don't argue with spouses; they will think you are a tiresome mate. Don't argue with strangers; they will think you are not friendly. My mother's rules, in fact, can be summed up in two words: Don't argue.
主題句中提出的 ＂certain rules＂ 指的是什么？展開句中通過四個 ＂Don't argue---" 逐一加以交代。從結構來看，這是一個比較典型的段落，它包括了主題句，推展句和結論句（即本段中的末句）。
1．1 主題句的位置
主題句通常放在段落的開端，其特點是開門見山地擺出問題，然后加以詳細說明。其作用是使文章的結構更清晰，更具說服力，便于讀者迅速地把握主題和想象全段的內容。主題句可以放在段中起到承上啟下的作用，或放在段尾起概括全段的作用。但初學者比較難于掌握，因而在四級考試中，考生應盡量采用將主題句放在段落開頭的寫作手法。
例1 Our life today depends very much on energy. In towns and in villages, on farms and in factories, machines have made life easier than it used to be. The machines use energy, and energy is needed for heating, lighting, communications, carrying goods ---everything. Factories and industrial plants use a great deal of energy to make the things that we use and buy and sell.
這段文字所講的主要是能源問題。第一句就概括性地提出“我們目前的生活很大程度上依賴于能源”。而隨后出現的三句都是具體事例，對第一句進行說明和論述。我們可以斷定第一句為該段的主題句（斜體部分）。
例2 （主題句）No one can avoid being influenced by advertisements. （推展句1）Much as we may pride ourselves on our good taste, we are no longer free to choose the things we want, for advertising exerts a subtle influence on us. （推展句2）In their efforts to persuade us to buy this or that product, advertisers have made a close study of human nature and have classified all our little weakness.
1．2 如何寫好主題句中的關鍵詞
段落的主題句對主題的限定主要是通過句中的關鍵詞來表現的。關鍵詞要盡量寫得具體些。對“具體”的要求包括兩個方面：一是要具體到能控制和限制段落的發展；二是要具體到能說明段落發展的方法。準確地把握關鍵詞是清楚地表達段落主題、寫好段落主題句的重要前提之一。
在上面的'例1，例2中，主題句的關鍵詞分別為：depends very much on energy; no one can avoid being influenced. 我們再看下列例句：
原句1: He can fix a bicycle himself.
深藍色字體部分應為主題句中的關鍵詞。但它只是限制了段落發展的部分內容，并沒有告訴讀者該用哪種方法展開，是用因果關系法還是用分類法？
修正：He can fix a bicycle himself in several simple steps.
修正：There are several reasons why he can fix a bicycle himself.
原句2: She tries to improve her looks.
深藍色字體部分應為主題句中的關鍵詞。她試著改變她面容的理由是什么？或者她采取什么方法來改善呢？我們無法從關鍵詞中清楚得知。
修正：She tries many ways to improve her looks.
修正：There are some reasons why she tries to improve her looks.
1.3 如何寫好主題句的中心思想
主題句由兩部分組成，即主題(topic)和中心思想（controlling idea）。中心思想的作用是導向(control)和制約(limit)。我們前面談到的關鍵詞就反映了中心思想。所謂導向就是規定段落的發展脈絡，所謂制約就是限制主題的覆蓋范圍，兩者不可分割。沒有導向，內容就會離題或偏題；沒有制約，內容就可能超出一個段落所能容納的范圍。
對于初學寫作的人來說，“導向”的重要性容易理解，但如果由他們自己來構思一個主題句，就可能忽視“制約”這一面。例如：
There are two ways in which one can own a book. The first is the property right you establish by paying for it, just as you have made it a part of yourself and the best way to make yourself a part of it is by writing in it.
本段的主題句如果沒有in which 引出的定語從句，那么two ways 不僅不能起制約作用，而且也不能起導向作用，句子本身讀起來也就使人覺得欠缺點什么。
Exercise is beneficial to your heart. A 22-year study was conducted by doctors in California. They found that people who work at physical jobs experience fewer heart attacks than other people. These active people work all the time at moderate speeds, their daily routine gives them an adequate amount of exercise and helps them stay in shape.
"Exercise is beneficial"這是毫無疑義的。但主題句中如不加上＂to your heart＂來加以 control 和 limit，那就流于空泛。
因此，緊緊把握主題句中controlling idea的導向和制約作用，是短文寫作成功關鍵之一。
2．推展句
2.1 主要推展句
主要推展句(major supporting statement)的主要特點是：圍繞段落主題句展開的每一個推展句本身都不要求作進一步的說明或證明，句與句之間的關系是相互獨立又是互相連接的。
例1：(主題句) There are several factors affecting climate. (推展句1)One factor is the mount of sunlight received. (推展句2)Altitude, or the height above sea level, also determines climate. (推展句3)The oceans have an effect on the climate of adjacent land. (推展句4)In addition, climate is influenced by the general circulation of the atmosphere.
主題句指出影響氣候的幾個因素。然后用四個擴展句說明四種因素。第一種是太陽光的接收量，第二種是海拔高度，第三句和第四句分別是海洋和大氣環流因素。
2.2 次要推展句
次要推展句(minor supporting statement)是指對主要推展句作進一步的事實分析和舉例說明。它從屬于某一個或某幾個推展句。
例2：(主題句)I don't teach because teaching is easy for me. (主要推展句1)Teaching is the most difficult of the various ways I have attempted to earn my living: mechanic, carpenter, writer. (主要推展句2)For me, teaching is a red-eye, sweaty-palm, sinking-stomach profession. (次要推展句1)Red-eye, because I never feel ready to teach no matter how late I stay up preparing. (次要推展句2)Sweaty-palm, because I'm always nervous before I enter the classroom, sure that I will be found out for the fool that I am. (次要推展句3)Sinking-stomach, because I leave the classroom an hour later convinced that I was even more boring than usual.
從屬于主要推展句2的三個次要推展句起著解釋說明作用，分別解釋red-eye, sweaty-palm, sinking-stomach的含義，這就更加形象生動地證明了 "teaching is not easy" 這個主題。
2．3 主要推展句與次要推展句的關系
主要推展句與次要推展句的關系(relation)基本可以遵循下面的“三部分”(three-part)規則。
1〕每個主要推展句都應該是對主題句中表示主要思想的關鍵詞的直接、明確的
說明。
2〕每個次要推展句都應該說明它的主要推展句。
3〕含有討論說明或分析的問題通常既要有主要推展素材，又要有次要推展素材。
2．4 寫好推展句的方法
主題句及關鍵詞確定后，開始選擇和主題有關的信息和素材。實質上，針對關鍵詞測試每一個所選擇的素材就是一個分類的過程。有一種常用的方法就是句子展開前加以設問，然后解答，即設問－解答(why-because)的方法。下面我們通過舉例來看一看這種分類過程是如何完成的。例3 ：
假設(suppose)
Topic sentence: English is an international language?
設問(why)
Why can we say English is an international language?
解答(because)
Because: English is spoken by pilots and airport control operators on all the airways of the world.
Because: Over 70 percent of the world's mail is written in English.
Because: More than 60 percent of the world's radio programs are in English.
Because: Pakistan was once one of the British colonies.
Because: Many members of the International Language Society are selected from English-spoken countries.
從上面可以看出，最初的三個推展句是和關鍵詞an international language一致的。第四句和主題句不統一，盡管第四句會成為另一主題句(Many Pakistanis speak English)的很好的推展句。第五句說服力不強。
當然，在寫成段落時，沒有必要在每個句子開頭寫上 ＂because＂，但是，在動筆展開句子時，頭腦里要想著這個詞，這種檢驗方法能幫助你把注意力集中在某個重心，圍繞主題思想層層展開。
上面我們討論了主要推展句的一種展開方法。而展開次要推展句的方法與主要推展句類似，這里我們就不再復述了。
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