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托福阅读修辞目的题：Fossil Preservation

2015-08-13 16:12:22来源：网络

　　【托福阅读题型：Fossil Preservation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：Fossil Preservation

　　【Paragraph 2】The term "fossil" often implies petrifaction, literally a transformation into stone. After the death of an　organism, the soft tissue is ordinarily consumed by scavengers and bacteria. The empty shell of a snail or clam may be　left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time. Indeed, unaltered shells of marine invertebrates are known from deposits over 100 million years old. In manymarine creatures, however, the skeleton is composed of a mineral variety of calcium carbonate called aragonite.

　　Although aragonite has the same composition as the more familiar mineral known as calcite, it has a different crystal　form, is relatively unstable, and in time changes to the more stable calcite.(Fossil Preservation)

　　Why does the author mention "aragonite" in the passage?

　　○ To emphasize that some fossils remain unaltered for millions of years

　　○ To contrast fossil formation in organisms with soft tissue and in organisms with hard shells

　　○ To explain that some marine organisms must undergo chemical changes in order to fossilize

　　○ To explain why fossil shells are more likely to survive than are fossil skeletons

　　答案见下一页：

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