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3. 主題句在文末
這種寫法的特點是：在敘述完某件事情或某個話題之后，用一句話交代事情的結果或對前面的敘述進行歸納。如：(廣東高考題)
In 1901, H.G. Wells, an English writer, wrote a book describing a trip to the moon. When the explorers (探險者) landed on the moon, they discovered that the moon was full of underground cities. They expressed their surprise to the "moon people" they met. In turn, the "moon people"expressed their surprise. "Why," they asked, "are you traveling to outer space when you don't even use your inner space?"
H.G. Wells could only imagine travel to the moon. In 1969, human beings really did land on the moon. People today know that there are no underground cities on the moon. How ever, the question that the "moon people" asked is still an interesting one. A growing number of scientists are seriously thinking about it.
Underground systems are already in place. Many cities have underground car parks. In some cities, such as Tokyo, Seoul and Montreal, there are large underground shopping areas. The 'Chunnel", a tunnel(隧道) connecting England and France, is now complete.
But what about underground cities? Japan's Taisei Corporation is designing a network of underground system, called "Alice Cities." The designers imagine using surface space for public parks and using underground space for flats, offices, shopping, and so on. A solar dome(太陽能穹頂) would cover the whole city.
Supporters of underground development say that building down rather than building up is a good way to use the earth's space. The surface, they say, can be used for farms, parks, gardens, and wilderness. H.G. Wells' "moon people" would agree. Would you?
What would be the best title for the text?
A. Alice Cities—cities of the future B. Space travel with H.G. Wells
C. Enjoy living underground D. Building down, not up
【分析】文章以月球人的問題Why are you traveling to outer space when you don't even use your inner space? 引起話題，接著講敘了人類目前對地下空間的利用現狀，結尾以地下空間開發的支持者的話點題 building down rather than building up is a good way to use the earth’s space。A選項只是本文話題的部分意思，不是主要話題；B選項與文章的意思無關；文章主要是講地下空間的開發利用，而不是講如何享受地下生活，因此C選項與文章的主題也無關；D選項符合文章的主要內容，與主題句的意思一致，因此，是該題的正確答案。
