by researcher Paul Martin, the wave of species extinctions that occurred Linein North America about 11,000 years (5)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 (10)Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demon- strate that Paleoindians hunted them. Nor were extinctions confined to large (15)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 (20)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, (25)arguing that humans have produced local extinctions elsewhere.But, according to historian Richard White, even the attribution of secondary responsibility may not be supported (30)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 (35)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.
Q6: Which of the following, if true, would most weaken Krech’s objections to Martin’s theory? A. Further studies showing that the climatic change that occurred at the end of the Pleistocene era was even more severe and widespread than was previously believed B. New discoveries indicating that Paleoindians made use of the small animals, plants, and insects that became extinc
C.Additional evidence indicating that widespread climatic change occurred not only at the end of the Pleistocene era but also in previous and subsequent eras. D. Researchers’ discoveries that many more species became extinct in North America at the end of the Pleistocene era than was previously believed
E. New discoveries establishing that both the arrival of humans in North America and the wave of Pleistocene extinctions took place much earlier than 11,000 years ago
Nor were extinctions confined to large (15)animals:small animals, plants, and insects disappeared, presumably not all through human consumption 这个是答案的原文对应点~ 他指出小时不限于大型的动物，还有.....推测并非由于人类的消耗而起 b直接削弱 你选c没啥道理啊~你要没明白把你选c的理由说出来
Krech also contradicts Martin’s exclusion of climatic change as an explanation by (20)asserting that widespread climatic change did indeed occur at the end of the Pleistocene
C说，不仅at the end时，在之前之后都有气候变换，所以既然一直有变换，那么就和气候变换没关系了啊！K的论据就被削弱了
k 说 at the end发生了气候变换，导致灭绝 选项C说，气候变换不止发生在end, 在之前之后都有，所以气候变换既然一直都在，那灭绝不就和它没关系了？
-- by 会员 yueqianchen (2010/3/4 21:25:14)
Krech also contradicts Martin’s exclusion of climatic change as an explanation by (20)asserting that widespread climatic change did indeed occur at the end of the Pleistocene
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发表于 2010-3-4 13:05:22
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