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.
探险家F在16世纪带回来的土壤检测出了高含量金子。在之后的两次取样中没有一次发现有金子,并且现代检测技术发现岛上土壤其实含金量很低。
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
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