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新托福阅读词汇150题(91)：bombard&approach

2015-08-14 10:53:58来源：网络

　　【新托福阅读词汇150题(91)：bombard&approach】新托福TPO阅读中，词汇题是重要托福阅读题型。托福阅读词汇题做题需要考生掌握一定的词汇量和做题技巧。本文中新东方在线托福网汇总了新托福阅读词汇150题：bombard&approach。

　　Paragraph 5: 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. Ir 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 Ir 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 Ir seems to require a special explanation. 【TPO8- Extinction of the Dinosaurs】

　　9. The word “bombard” in the passage is closest in meaning to

　　○ approach

　　○ strike

　　○ pass

　　○ circle

　　答案见下一页：

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