托福阅读修辞目的题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的修辞目的题及其对应的解析，供大家参考使用。本文带来的是TPO27-2的修辞目的题，一起来看看吧。
TPO27-2 The Formation of Volcanic Islands
Paragraph 1: Earth’s surface is not made up of a single sheet of rock that forms a crust but rather a number of “tectonic plates” that fit closely, like the pieces of a gain jigsaw puzzle. Some plates carry islands or continents, others form the seafloor. All are slowly moving because the plates float on a denser sem-iliquid mantle, the layer between the crust and Earth’s core. The plates have edges that are spreading ridges (where two plates are moving apart and new seafloor is being created), subduction zones (where two plates collide and one plunges beneath the other), or transform faults (where two plates neither converge nor diverge but merely move past one another). It is at the boundaries between plates that most of Earth’s volcanism and earthquake activity occur.
1.The author mentions “spreading ridges”, “subduction zones”, and “transform faults” in order to
O illustrate that the boundaries of tectonic plates are neat, thin lines
O explain why some tectonic plates carry islands or continents while others form the seafloor
O explain the complex nature of the edges of tectonic plates
O provide examples of areas of tectonic plates where little geologic action occurs
答案：C，原文这部分介绍了各种不同的edges的现象，并做了详细的解释，前面也说到plate的组成就像是jigsaw puzzle，从两处可以看出应该是要体现其复杂性。A与原文矛盾，原文并没有对B做出解释，D原文给出的是geologic action常发的地方，而不是little ~ occurs。
段落翻译：1 地球的外壳并不是由单块岩石形成的，而是许多的“构造板块”严密的组合在一起的，就像是一个巨大的拼图。一些板块承载着岛屿或是大陆，其它的则形成海底。所有板块都在缓慢移动，因为它们都漂浮在密度更大的半液态的介于地壳和地核之间的地幔上。板块的边缘是扩张脊(两个板块分离，新的海底形成的地方)，俯冲带(两板块碰撞，一个倾入到另一个下面)，或者是形成断层(两板块既不聚集也不分散，但只是互相错位)。板块边界是地球上的火山和地震的高发地。
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.
7.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”?
O To point out differences between the Hawaii island chain and other volcanic island chains
O To question the idea that all the islands in an island chain have been formed by volcanic activity
O To explain why Wilson hypothesis was initially difficult to accept
O To provide evidence in support of Daly’s and Wilson’s ideas about how the Hawaii islands were formed
答案：D
段落翻译：虽然这个理论并没有被很快接受，夏威夷和其它群岛岩浆的年龄测试表明了它们的年龄都从活跃的火山开始依次增加，正如Daly所说。Wilson对数据的分析已经成为了板块构造论的核心部分。大多的发生在板块内部的火山爆发都是由地幔柱造成的;地幔柱是从地幔深处涌出的熔岩柱体。只要火山在一个地幔柱上面，它就是一个活动的“热点”。地幔柱很显然是起源于很深的地方，很可能位于地核和地幔的交界处，并且已经活跃了很久。由夏威夷热点形成的最老的火山已经有近8千万年的时间了。其它的岛屿，包括太平洋的塔希提岛和东部群岛，印度洋留尼汪岛和毛里求斯群岛，实际上，多数世界上大洋中大岛都是由地幔柱的扩展形成的。
以上就是托福阅读TPO27-2中的修辞目的题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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