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托福阅读词汇题:extended&specific

2015-08-25 10:40:55来源:网络

  【托福阅读词汇题:extended&specific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:extended&specific

  Paragraph 3: What could cause such high rates of extinction? There are several hypotheses, including warming or cooling of Earth, changes in seasonal fluctuations or ocean currents, and changing positions of the continents. Biological hypotheses include ecological changes brought about by the evolution of cooperation between insects and flowering plants or of bottom-feeding predators in the oceans. Some of the proposed mechanisms required a very brief period during which all extinctions suddenly took place; other mechanisms would be more likely to have taken place more gradually, over an extended period, or at different times on different continents. Some hypotheses fail to account for simultaneous extinctions on land and in the seas. Each mass extinction may have had a different cause. Evidence points to hunting by humans and habitat destruction as the likely causes for the current mass extinction. 【TPO15- Mass Extinctions】

  3. The word extended in the passage is closest in meaning to

  ○ specific

  ○ unlimited

  ○ reasonable

  ○ long

  答案见下一页:

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