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题库 / Prep2012-CR-70
Frobisher, a sixteenth-century English explorer, had soil samples from Canada's Kodlunarn Island examined for gold content. Because high gold content was reported, Elizabeth I funded two mining expeditions. Neither expedition found any gold there. Modern analysis of the island's soil indicates a very low gold content.Thus the methods used to determine the gold content of Frobisher's samples must have been inaccurate.
Which of the following is an assumption on which the argument depends?
The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century.
The two mining expeditions funded by I did not mine the same part of Kodlunarn Island.
The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century.
Frobisher did not have soil samples from any other Canadian island examined for gold content.
Gold was not added to the samples collected by Frobisher before the samples were examined.
P2：现代技术检测 low gold content
C: F的检测方法不准
Assuption假设：
Gold was not added to the samples collected by Frobisher before the samples were examined. 在样本检测前金子没有被加入样本；
取反：. 在样本检测前金子被被加入样本→所以才能测出金含量高→所以F的测量方法没问题，削弱了原结论
结论是用于检测F的土壤含金技术肯定是错误的。问assume
choice a, 岛上今天的土壤含金量比16世纪低很多。取非，今天的土壤含金量等于甚至高于16世纪的土壤含金量。无法削弱结论
choice e, 金子不是刻意由F加入土壤样本中的。correct
A. K岛的金含量现在比16世纪低；测试方法就是16世纪的，跟现在含金量多少无关
B. 两个开矿队没有开采K岛的同一区域；无关，排
C. 用来测F样本的方法和16世纪其他方法不同；无关比较，排
D. F没有从其他岛上取样本来测金含量；其他岛，跳出范围，排
E. 在样本检测前金子没有被加入样本；取反即有金子加入样本，测出金含量高不能说明测量方法不精确，取反削弱结论，正确