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托福阅读词汇题：describe&challenge

2015-08-25 10:41:45来源：网络

　　【托福阅读词汇题：describe&challenge】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：describe&challenge。

　　Paragraph 5: Of the various hypotheses attempting to account for the late Cretaceous extinctions, the one that has attracted the most attention in recent years is the asteroid-impact hypothesis first suggested by Luis and Walter Alvarez. According to this hypothesis, Earth collided with an asteroid with an estimated diameter of 10 kilometers, or with several asteroids, the combined mass of which was comparable. The force of collision spewed large amounts of debris into the atmosphere, darkening the skies for several years before the finer particles settled. The reduced level of photosynthesis led to a massive decline in plant life of all kinds, and this caused massive starvation first of herbivores and subsequently of carnivores. The mass extinction would have occurred very suddenly under this hypothesis. 【TPO15- Mass Extinctions】

　　8. The phrase account for in the passage is closest in meaning to

　　○describe

　　○challenge

　　○explain

　　○test

　　答案见下一页：

本文关键字: 新托福阅读 托福阅读词汇 托福词汇题

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