托福阅读事实信息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阅读中考察的事实信息题及其对应的解析，供大家参考使用。本文带来的是TPO5-3的事实信息题，一起来看看吧。
TPO5-3 The Cambrian Explosion
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Scientists have asked important questions about this explosion for more than a century. Why did it occur so late in the history of Earth? The origin of multicellular forms of life seems a relatively simple step compared to the origin of life itself. Why does the fossil record not document the series of evolutionary changes during the evolution of animals? Why did animal life evolve so quickly? Paleontologists continue to search the fossil record for answers to these questions
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One interpretation regarding the absence of fossils during this important 100-million-year period is that early animals were soft bodied and simply did not fossilize. Fossilization of soft-bodied animals is less likely than fossilization of hard-bodied animals, but it does occur. Conditions that promote fossilization of soft-bodied animals include very rapid covering by sediments that create an environment that discourages decomposition. In fact, fossil beds containing soft-bodied animals have been known for many years.
4. The period discussed in the passage is referred to as an explosion because it
occurred 0.6 billion years ago, late in Earth’s history
was characterized by the unusually fast evolution of many new life-forms.
Was characterized by widespread animal extinction
Was characterized by violent volcanic eruptions
解析:以explosion做关键词定位至第一段最后一句，注意这道题的相关信息不在第二段而是在第一段。说rapid origin and diversification所以叫explosion，所以B正确。A的时间不能作为explosion的依据;C灭绝说反了;D火山爆发没说
【2】一个多世纪以来，科学家们对这次大爆发一直有疑惑。为什么它发生的得这么晚?多细胞生物的出现相对于生命的出现而言则是一次相对简单的进化。为什么化石没有记录下动物演化的一系列变化呢?为什么动物生命进化得如此迅速呢?古生物学家们仍旧在研究化石记录以期回答这些问题。
【3】关于这重要的1亿年内化石的缺失，有一种解释是早期的动物都是软体动物，它们很难形成化石。软体动物的化石比硬体动物化石少见得多，但是也是存在的。促使软体动物成为化石的条件是沉积物的迅速覆盖以形成一个抑制分解的环境。事实上，含有软体动物的化石层在很多年以前就已经为人们所知了。
6. Which of the following best describes the relationship between Paragraph2 and Paragraph3?
Paragraph2 puts forward several scientific claims, one of which is rejected in Paragraph3
Paragraph2 poses several questions, and Paragraph3offers a possible answer to one of them
Paragraph2 presents outdated traditional views, while Paragraph3presents the current scientific conclusions.
Paragraph2 introduces a generalization that is illustrated by specific examples in Paragraph3
解析： 问整段的题，注意各段的开头句;第二段提出了很多问题，而第三段一开始就给了一个explanation，说明是第二段问第三段答，所以B正确。第三段与第二段没有对比或者反对的关系，所以A和C都不对;也不是详细阐述，D错
【2】一个多世纪以来，科学家们对这次大爆发一直有疑惑。为什么它发生的得这么晚?多细胞生物的出现相对于生命的出现而言则是一次相对简单的进化。为什么化石没有记录下动物演化的一系列变化呢?为什么动物生命进化得如此迅速呢?古生物学家们仍旧在研究化石记录以期回答这些问题。
【3】关于这重要的1亿年内化石的缺失，有一种解释是早期的动物都是软体动物，它们很难形成化石。软体动物的化石比硬体动物化石少见得多，但是也是存在的。促使软体动物成为化石的条件是沉积物的迅速覆盖以形成一个抑制分解的环境。事实上，含有软体动物的化石层在很多年以前就已经为人们所知了。
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Fossil formations like the Burgess Shale show that evolution cannot always be thought of as a slow progression. The Cambrian explosion involved rapid evolutionary diversification, followed by the extinction of many unique animals. Why was this evolution so rapid? No one really knows. Many zoologists believe that it was because so many ecological niches were available with virtually no competition from existing species. Will zoologists ever know the evolutionary sequences in the Cambrian explosion? Perhaps another ancient fossil bed of soft-bodied animals from 600-million-year-old seas is awaiting discovery.
11. Sidneyia is an example of
a relative of Anomalocaris and Wiwaxia
a previously unknown Burgess Shale animal
an extinct member of a currently existing category of animals
an animal that cannot be assigned to any modern animal group
解析： 也是一道修辞目的题，前句说BS有很多已经灭绝的动物，它们是现代动物group的代表;然后就=给出了S这个例子，所以C正确;不要受到B的干扰，原文说S是一种以前不知道的anthropod的代表，没说是以前不知道的BS的代表，所以错
【7】像伯吉斯页岩化石群这样的化石层表明进化不能总是被认为是缓慢的过程。寒武纪大爆涉及到了快速的进化分化，接着就是很多独特动物的灭绝。为什么这种进化如此迅速呢?没有人真正的明白。很多动物学家认为这是很多几乎没有任何竞争性物种的环境使然。动物学家们是否知道寒武纪大爆发的动物的进化顺序呢?或许另一些含有来自于6亿年前的海洋动物的化石亟待发现。
以上就是托福阅读TPO5-3中的事实信息题及其解析，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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