注：oceanography 最末一段与第一段首句都出现 oceanagraphy, 回环结构。

　　21. The passage implies that the telegraph cable was built mainly _________.

　　A) for oceanographic studies

　　B) for military purposes

　　C) for business considerations

　　D) for investigating the depths of the oceans

　　注：推理题。定位第三段,倒数第三行。选项 D 的内容出现在第四段，为窜段选项

　　For most people the sea was remote, and with the exception of early intercontinental travelers or others who earned a living from the sea, there was little reason to ask many questions about it, let alone to ask what lay beneath the surface. The first time that the question What is at the bottom of the oceans? had to be answered with any commercial consequence was when the laying of a telegraph cable from Europe to America was proposed. The engineers had to know the depth profile of the route to estimate the length of cable that had to be manufactured.

【四六级考试阅读的备考:课堂笔记(3)】相关文章：

★ 六级阅读练习 2011.04.09

★ 四六级考试阅读的备考:课堂笔记(16)

★ 怎样回答四六级考试阅读题中的态度类的问题

★ 2009年12月英语六级考试快速阅读的模拟题4

★ 英语四级考试阅读习题及答案解析(1)

★ 四六级考试阅读的备考:课堂笔记(5)

★ 六级考试阅读备考课堂笔记(2)

★ 2012年6月英语六级考试阅读理解训练与解析

★ 2011英语六级考试阅读备考常见问题的解答

★ 六级阅读练习 2011.03.01