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托福阅读修辞目的题：Volcanic Islands

2015-08-13 16:20:56来源：网络

　　【托福阅读题型：Volcanic Islands修辞目的题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之修辞目的题

　　托福阅读修辞目的题：Volcanic Islands

　　【Paragraph 4】Although this idea was not immediately accepted, the dating of lavas in the Hawaii (and other)　chains showed that their ages increase away from the presently active volcano, just as Daly had suggested. Wilson’s　analysis of these data is now a central part of plate tectonics. Most volcanoes that occur in the interiors of plates are　believed to be produced by mantle plumes, columns of molten rock that rise from deep within the mantle. A volcano　remains an active “hot spot” as long as it is over the plume. The plumes apparently originate at great depths, perhaps as　deep as the boundary between the core and the mantle, and many have been active for a very long time. The oldest　volcanoes in the Hawaii hot-spot trail have ages close to 80 million years. Other islands, including Tahiti and Easter　Islands in the pacific, Reunion and Mauritius in the India Ocean, and indeed most of the large islands in the world’s　oceans, owe their existence to mantle plumes. (The Formation of Volcanic Islands)

　　Why does the author provide the information that “the dating of lavas in the Hawaii (and other) chains showed that their ages increase away from the presently active volcano”?

　　○ To point out differences between the Hawaii island chain and other volcanic island chains

　　○ To question the idea that all the islands in an island chain have been formed by volcanic activity

　　○ To explain why Wilson hypothesis was initially difficult to accept

　　○ To provide evidence in support of Daly’s and Wilson’s ideas about how the Hawaii islands were formed

　　答案见下一页：

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