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托福阅读修辞目的题：The Cambrian Explosion

2015-08-11 15:41:17来源：网络

　　【托福阅读题型：The Cambrian Explosion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：The Cambrian Explosion

　　【Paragraph 6】A third fossil formation containing both soft-bodied and hard-bodied animals provides evidence of　the result of the Cambrian explosion. This fossil formation, called the Burgess Shale, is in Yoho National Park in the　　Canadian Rocky Mountains of British Columbia. Shortly after the Cambrian explosion, mud slides rapidly buried　thousands of marine animals under conditions that favored fossilization. These fossil beds provide evidence of about 32　modern animal groups, plus about 20 other animal body forms that are so different from any modern animals that they　　cannot be assigned to any one of the modern groups. These unassignable animals include a large swimming predator　called Anomalocaris and a soft-bodied animal called Wiwaxia, which ate detritus or algae. The Burgess Shale formation　also has fossils of many extinct representatives of modern animal groups. For example, a well-known Burgess Shale　animal called Sidneyia is a representative of a previously unknown group of arthropods (a category of animals that　includes insects, spiders, mites, and crabs).(The Cambrian Explosion)

　　Why does the author mention “Anomalocans” and “Wiwaxia”?

　　○ To contrast predators with animals that eat plants such as algae

　　○ To question the effects of rapid mud slides on fossilization

　　○ To suggest that much is still unknown about animals found in the Burgess Shale

　　○ To provide examples of fossils that cannot be assigned to a modern animal group

　　答案见下一页：

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