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4. 主题句以首尾呼应的形式出现在文首和文末
这种写法的特点是：文章一开始就点题，接着举例，最后回归主题。如：(全国高考题)
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】文章的第一段就两句话，第一句点题，第二交代了Shu Pulong成为蛇医的原因；第二、第三段举例说明Shu Pulong如何了解到农民被蛇咬的情况；第四段回归主题，强调是由于第二、第三段中所交代的事例促使Shu Pulong决心成为蛇医。题目的A选项与文章中的信息无关；B、C两个选项只涉及到文章所举的例子的某个方面；D选项能涵盖首位两个自然段，即主题句，的信息，因此是正确答案。
