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托福阅读修辞目的题：William　Smith

2015-08-11 15:45:06来源：网络

　　【托福阅读题型：William　Smith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：William　Smith

　　【Paragraph 3】In 1831 when Smith was finally recognized by the Geological Society of London as the “father of　English geology,” it was not only for his maps but also for something even more important. Ever since people had begun　to catalog the strata in particular outcrops, there had been the hope that these could somehow be used to calculate　geological time. But as more and more accumulations of strata were cataloged in more and more places, it became clear　that the sequences of rocks sometimes differed from region to region and that no rock type was ever going to become a　reliable time marker throughout the world. Even without the problem of regional differences, rocks present a difficulty as　unique time markers. Quartz is quartz—a silicon ion surrounded by four oxygen ions—there’s no difference at all　between two-million-year-old Pleistocene quartz and Cambrian quartz created over 500 million years ago.(William　Smith)

　　Why does the author use the phrase “Quartz is quartz”?

　　○To describe how the differences between Pleistocene and Cambrian quartz reveal information about dating　rocks

　　○To point out that the chemical composition of quartz makes it more difficult to date than other rocks

　　○To provide an example of how regional differences in rock sequences can make a particular rock difficult to date

　　○To explain that rocks are difficult to use for dating because their chemical compositions always remain the same　over time

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 修辞目的题

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