Critical Reasoning

[Critical Reasoning] 试题详情

Charcoal from a hearth site in Colorado, 2,000 miles south of Alaska, is known to be 11,200 years old.  Researchers reasoned that, since glaciers prevented human migration south from the Alaska-Siberia land bridge between 18,000 and 11,000 years ago, humans must have come to the Americas more than 18,000 years ago.
 
Which of the following pieces of new evidence would cast doubt on the conclusion drawn above?

Options:

Using new radiocarbon dating techniques, it was determined that the charcoal from the Colorado site was at least 11,400 years old.
Another campsite was found in New Mexico with remains dated at 16,000 years old.
A computer simulation of glacial activity showed that it would already have been impossible for humans to travel south overland from Alaska 18,500 years ago.
Using new radiocarbon dating techniques, it was proved that an ice-free corridor allowed passage south from the Alaska-Siberia land bridge at least 11,400 years ago.
Studies of various other hunting-gathering populations showed convincingly that, once the glaciers allowed passage, humans could have migrated from Alaska to Colorado in about 20 years.

Correct:

D

Critical Reasoning

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[点此查看答疑][GWD]Critical Reasoning

感觉c和d都沾边,又仔细看了一遍题,人问的是哪个选项削弱原来的结论,就不知道怎么用沾边的标准来解题了,稍微想了两个选项的内容,觉得c更能削弱,d的at least的意思没看懂
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104浏览

[点此查看答疑][GWD]Critical Reasoning

这道题各种都没看懂。。能否请老师把原文和五个选项都讲一下
0评分
132浏览

[点此查看答疑][GWD]Critical Reasoning

感觉c和d都沾边,又仔细看了一遍题,人问的是哪个选项削弱原来的结论,就不知道怎么用沾边的标准来解题了,稍微想了两个选项的内容,觉得c更能削弱,d的at least的意思没看懂
0评分
104浏览

[点此查看答疑][GWD]Critical Reasoning

这道题各种都没看懂。。能否请老师把原文和五个选项都讲一下

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