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GMAT阅读题型练习(1067)

2018-04-17 09:04:00 来源:网络GMAT资料下载

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  GMAT阅读题目内容 

  According to a theory advanced by researcher Paul Martin, the wave of species extinctions that occurredin North America about 11,000 years ago, at the end of the Pleistocene era, can be directly attributed to the arrival of humans, i.e., the Paleoindians, who were ancestors of modern Native Americans. However, anthropologist Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demonstrate that Paleoindians hunted them. Nor were extinctions confined to large animals: small animals, plants, and insects disappeared, presumably not all through human consumption. Krech also contradicts Martin's exclusion of climatic change as an explanation by asserting that widespread climatic change did indeed occur at the end of the Pleistocene. Still, Krech attributes secondary if not primary responsibility for the extinctions to the Paleoindians, arguing that humans have produced local extinctions elsewhere. But, according to historian Richard White, even the attribution of secondary responsibility may not be supported by the evidence. White observes that Martin's thesis depends on coinciding dates for the arrival of humans and the decline of large animal species, and Krech, though aware that the dates are controversial, does not challenge them; yet recent archaeological discoveries are providing evidence that the date of human arrival was much earlier than 11,000 years ago.

  1、Which of the following is true about Martin's theory, as that theory is described in the passage?

  A.It assumes that the Paleoindians were primarily dependent on hunting for survival.

  B.It denies that the Pleistocene species extinctions were caused by climate change.

  C.It uses as evidence the fact that humans have produced local extinctions in other situations.

  D.It attempts to address the controversy over the date of human arrival in North America.

  E.It admits the possibility that factors other than the arrival of humans played a role in the Pleistocene extinctions.

  

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