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题库 / Prep2007E1-CR-46
Archaeologists in Michigan have excavated a Native American camp near Dumaw Creek. Radiocarbon dating of animal bones found at the site indicates that the camp dates from some time between 1605 and 1755. However, the camp probably dates to no later than 1630, since no European trade goods were found at the site, and European traders were active in the region from the 1620's onward.
Which of the following, if true, most strengthens the argument?
Due to trade among Native Americans, some European trade goods would have reached the area before the European traders themselves did.
At all camps in the region that have been reliably dated to the late 1620's, remains of European trade goods have been found.
The first European trade goods to reach the area would have been considered especially valuable and preserved as much as possible from loss or destruction.
The first European traders in the area followed soon after the first European explorers.
The site is that of a temporary camp that would have been used seasonally for a few years and then abandoned.
因果推理。
因：这个营地没有被发现有欧洲贸易品，欧洲商人在1620年代在这个地方就很活跃。
果：这个营地可以追溯到1930之前。
B选项是加强了因中可能存在的漏洞——可能这个营地中之前是有贸易的，但只是没有留下来贸易品而已。理解这点就理解了B选项：在这个地区所有确定被追溯到1620s的营地中，都发现了欧洲贸易品。也就是说，有贸易品被发现 跟 可以被追溯到1620s之间是确定的因果关系。也就加强了题干中的因果。
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