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托福阅读题型之插入题范例(13)

2015-08-03 11:24:32来源：网络

　　【toefl托福阅读题型之插入题范例(13)】托福阅读插入题本质是考察考生的关联句子能力，语法及逻辑关系。新东方在线托福网为大家带来托福阅读插入题范例(13)，希望对大家托福备考有所帮助。更多精彩尽请关注新东方在线托福网!

　　查看全部：托福阅读插入题范例

　　托福阅读插入题例题

　　例题13：

　　Ir has not been common at Earth’s since the very beginning of the planet’s history. Because it usually exists in a metallic state, it was preferentially incorporated in Earth’s core as the planet cooled and consolidated. lr is found in high concentrations in some meteorites, in which the solar system’s original chemical composition is preserved. Even today, microscopic meteorites continually bombard Earth, falling on both land and sea. By measuring how many of these meteorites fall to Earth over a given period of time, scientists can estimate how long it might have taken to deposit the observed amount of lr in the boundary clay. █These calculations suggest that a period of about one million years would have been required. █However, other reliable evidence suggests that the deposition of the boundary clay could not have taken one million years. █So the unusually high concentration of lr seems to require a special explanation. █

　　Look at the four squares [█] that indicate where the following sentence could be added to the passage.

　　Consequently, the idea that the lr in the boundary clay came from microscopic meteorites cannot be accepted.

　　Where could the sentence best fit?

　　答案见下一页>>>>


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　　更多托福阅读题型相关知识点，尽请关注>>>>新东方在线托福阅读！

本文关键字: 托福阅读 插入题 托福阅读题型

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