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托福阅读笔记之TPO5 The Cambrian
Explosion-智课教育旗下智课教育
本文和大家分享的托福阅读笔记是TPO5的内容，希望能够为正在备考托福的同学带来帮助，共同提高托福阅读方面的能力。
托福阅读笔记。说到托福阅读备考，TPO是必不可少的备考神器，通过TPO练习来更好的适应阅读考试的节奏。本文小编带来的是TPO5 The Cambrianletitbe
Explosion的学习笔记，希望能够与正在备考的大家一起进步。
TPO5 The Cambrian Explosion
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文章题材：生命科学—寒武纪大爆发
文章结构：本文介绍寒武纪大爆发，现代动物族群在短暂的寒武纪出现和快速分化，连续性的化石记录缺失的原因，已发现的含有软体动物化石的化石层及他们提供的信息，同时由这些化石层所带来的启示。
第一段：介绍了寒武纪大爆发的含义。
第二段：科学家对寒武纪大爆发的未解之谜。
第三段：对化石记录确实的解释，有可能是因为早期动物大多是软体动物，很难形成化石。
第四-六段：介绍了几种比较广为人知的软体动物化石层，伊迪卡拉化石层、托莫特化石层和伯吉斯页岩化石层。
第七段：动物迅速进化的可能原因，确切的原因无人得知。
常见词汇：
Explosion n. 爆炸；爆发
夏奇拉最好听的歌>youngchildrenTimescale时标
Diversification n. 多样化；变化
Discourage vt.使气馁，阻碍
Exclusively adv.排他地(独占地，专门地)
21世纪大学实用英语Sediment n. 沉积；沉淀物
labor是什么意思
Assign vt. 分配；指派
Slide n. 滑动；幻灯片vt. 滑动
space是什么意思Await vt. 等候，等待
Arthropod n.节肢动物
题目设置：
本文中题型的分配是4道词汇题，3道事实信息题，句子插入题、句子简化题、文中总结题等，延续一贯的题目设置。文章结构清晰，难度适中，题目难度适中，在解题时注意找准题干和文章内容的对应。
易错题解析：
Paragraph5: A slightly younger fossil formation containing animal remains is the Tommotian formation, named after a locale in Russia. It dates to the very early Cambrian period, and it also contains only soft-bodied forms. At one time, the animals prent in the fossil beds were assigned to various modern animal groups, but most paleontologists now agree that all Tommotian fossils reprent unique body forms that aro in the early Cambrian period and disappeared before the end of the period, leaving no descendants in modern animal groups.
7.Which of the ntences below best express the esntial information in the highlighted ntence in the passage? Incorrect choices change the meaning in important ways or leave out esntial information.
oahA. The animals found in the Tommotian fossil bed were once thought to belong to a variety of modern animal groups, but now they are thought to have descended from a single group.
B. Animals in the Tommotian fossil beds were initially assigned to modern animal groups but are now thought to belong to groups that emerged and died out during the Cambrian period.
C. Though at first they thought otherwi, paleontologists now agree that the animals in the Tommotian have body forms from which modern animals have descended.still是什么意思
D. It is unclear whether the Tommotian fossils from the early Cambrian period reprent unique body forms or whether they should be assigned to various modern animal groups.
idioms题型：句子简化题。答案是(B)
