GMAT申友逻辑CR题库-Perkins: According to an article I read, the woolly mammoth‘s extinction in North America coincided with a migration of humans-破解版12-真题答案解析

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Perkins: According to an article I read, the woolly mammoth‘s

extinction in North America coincided with a migration of humans onto the continent 12,000 years ago, and stone spearheads from this period indicate that these people were hunters. But the author's contention that being hunted by humans contributed to the woolly mammoth‘s extinction is surely wrong since, as paleontologists know, no spearheads have ever been found among the many mammoth bones that have been unearthed.

Which of the following, if true, provides the strongest reason for discounting the evidence Perkins cites in arguing against the contention that being hunted by humans contributed to the North American extinction of woolly mammoths?

A. At sites where mammoth bones dating from 12,000 years ago have been unearthed, bones of other mammals

have rarely been found.

B. The stone from which stone spearheads were made is unlikely to have disintegrated over the course of 12,000

years.

C. Conditions in North America 12,000 years ago were such that humans could not have survived there on a diet

that did not include substantial amounts of meat.

D. Cave paintings in North America that date from 12,000 years ago depict woolly mammoths as well as a variety

of other animals, including deer and buffalo.

E. Because of the great effort that would have been required to produce each stone spearhead, hunters would

have been unlikely to leave them behind.

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答案：

Perkins: 根据

我读的一篇文章，北美猛犸灭绝和12000年前人类迁徙有关，石矛头表明这些人是猎人。但作者认为猎人导致猛犸灭绝是错的，因为没有矛头在猛犸骨头上发现。削弱题削弱Perkins的说法 A. 在发现猛犸地点，其他哺乳动物骨头很少被发现；无关，排 B. 石矛用石经过12000年不可能分解；增强，方向反，排 C. 12000年前人没有肉不能生存；说明要打猎为生，但矛头没在猛犸上发现，不一定猎杀猛犸，无法削弱，排 D. 岩画显示12000年前既有猛犸也有其他动物；无关，排 E. 因为做石矛头很费事，猎人会留下它们；说明猎人在杀猛犸后会把矛头回收再用，即猎人会导致猛犸灭绝，削弱结论，正确