扫描二维码，直接登录
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.
P1：以前，F报告说有 high gold content 但实际却没找到gold:
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
登录 或 注册 后可以参加讨论