[典题示例]
Sometime in the early 1960s, a significant thing happened in Sydney, Australia. The city discovered its harbor. Then, one after another, Sydney discovered lots of things that were just sort of there—broad parks, superb beaches, and a culturally diverse population. But it is the harbor that makes the city.
What is the paragraph mainly about? ()

A.Sydney’s striking architecture.
B.The cultural diversity of Sydney.
C.The key to Sydney’s development.
D.Sydney’s tourist attractions in the 1960s.
[技法分解]
第一步:观察段落是“总——分”或“分——总”结构。
本段是“分——总”结构,前面几句是港口发展历史细节,最后一句总结。
第二步:根据表示“转折、因果、总结”的关键词确定段落主题。最后一句的关键词But表明这是本段的重点。
第三步:比对选项可知C项正确。

1. C 本段是“分——总”结构,前面几句是港口发展历史细节,最后一句总结。根据表示“转折、因果、总结”的关键词But确定本段重点是港口成就了悉尼，即悉尼发展的关键。比对选项可知C项正确。