4. 主題句以首尾呼應(yīng)的形式出現(xiàn)在文首和文末
這種寫法的特點是：文章一開始就點題，接著舉例，最后回歸主題。如：(全國高考題)
Shu Pulong has helped at least 1000 people bitten by snakes. "It was seeing people with snake bites that led me to this career," he said.

In 1963, after his army service, Shu entered a medical school and later became a doctor of Chinese medicine. As part of his studies he had to work in the mountains. There he often heard of people who had their arms and legs cut off after a snake bite in order to save their lives.

"I was greatly upset by the story of an old farmer I met. It was a very hot afternoon. The old man was pulling grass in his fields when he felt a pain in his left hand. He at once realized he had been bitten by a poisonous snake. In no time he wrapped a cloth tightly around his arm to stop the poison spreading to his heart. Rushing home he shouted 'Bring me the knife!' Minutes later the man lost his arm forever."

"The sad story touched me so much that I decided to devote myself to helping people bitten by snakes,"Shu said.
The best headline for this newspaper article is ______.
A. Astonishing Medicine B. Farmer Loses Arms
C. Dangerous Bites D. Snake Doctor
【分析】文章的第一段就兩句話，第一句點題，第二交代了Shu Pulong成為蛇醫(yī)的原因；第二、第三段舉例說明Shu Pulong如何了解到農(nóng)民被蛇咬的情況；第四段回歸主題，強(qiáng)調(diào)是由于第二、第三段中所交代的事例促使Shu Pulong決心成為蛇醫(yī)。題目的A選項與文章中的信息無關(guān)；B、C兩個選項只涉及到文章所舉的例子的某個方面；D選項能涵蓋首位兩個自然段，即主題句，的信息，因此是正確答案。

來源:可可英語 http://www.ccdyzl.cn/gaokao/201108/151891.shtml