这题assumption没有明显的gap,所以通过排除他因，即defender。
把所有选项进行取非，如可以成为原文的一个weaken即答案。
答案E 的取非，是在样品被测试前F添加了gold到样品中。weaken了结论，说明是人为问题，而不是methods的问题。
-- by 会员 andycooler (2010/2/22 15:43:13)
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?
原文说了两件事：检测金含量的高低，方法是否精确。
A. The gold content of the soil on Kodlunarn Island is much lower today than it was in the sixteenth century. 主干无否定词排除
B. The two mining expeditions funded by Elizabeth I did not mine the same part of Kodlunarn Island. 方法没检查同一个地方
C. The methods used to assess gold content of the soil samples provided by Frobisher were different from those generally used in the sixteenth century.主干无否定词排除
D. Frobisher did not have soil samples from any other Canadian island examined for gold content. any other绝对化
E. Gold was not added to the soil samples collected by Frobisher before the samples were examined. 金没有被添加
剩BE
看B 方法没检查同一个地方和方法是否精确是两回事，你必须要往里加入“是否检查同一个地方”和“这方法时候精确”间的关系才能使B对原文起作用
E 金没有被添加 和原文金含量的高低有关 不用加入自己的想法就获得
选E
-- by 会员 mobilecdpyn (2010/2/22 22:24:08)