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3. 主题句在文末
这种写法的特点是：在叙述完某件事情或某个话题之后，用一句话交代事情的结果或对前面的叙述进行归纳。如：(广东高考题)
In 1901, H.G. Wells, an English writer, wrote a book describing a trip to the moon. When the explorers (探险者) 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(太阳能穹顶) 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】文章以月球人的问题Why are you traveling to outer space when you don't even use your inner space? 引起话题，接着讲叙了人类目前对地下空间的利用现状，结尾以地下空间开发的支持者的话点题 building down rather than building up is a good way to use the earth’s space。A选项只是本文话题的部分意思，不是主要话题；B选项与文章的意思无关；文章主要是讲地下空间的开发利用，而不是讲如何享受地下生活，因此C选项与文章的主题也无关；D选项符合文章的主要内容，与主题句的意思一致，因此，是该题的正确答案。
