The ancient Nubians inhabited an area in which typhus occurs, yet surprisingly few of their skeletons show the usual evidence of this disease.The skeletons do show deposits of tetracycline, an antibiotic produced by a bacterium common in Nubian soil.This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread.Thus, tetracycline in their food probably explains the low incidence of typhus among ancient Nubians.
Which of the following is an assumption on which the argument relies?
B
A.Infectious diseases other than typhus to which the ancient Nubians were exposed are unaffected by tetracycline.无关
B.Tetracycline is not rendered ineffective as an antibiotic by exposure to the processes involved in making bread and beer.取非：te在加工的时候会变得无效，削弱原文
C.Typhus cannot be transmitted by ingesting bread or beer contaminated with the infectious agents of this disease.取非t可以通过吃感染了这种病的面包和啤酒传播
D.Bread and beer were the only items in the diet of the ancient Nubians which could have contained tetracycline.无关
B.Tetracycline is not rendered ineffective as an antibiotic by exposure to the processes involved in making bread and beer. 这里是有一个gap：te在用于加工食物的干的谷物上可以抵抗t病；te在食物上可以抵抗t病。假设：在食物上和干的谷物上的te是一样的---即一样有效
C.Typhus cannot be transmitted by ingesting bread or beer contaminated with the infectious agents of this disease.取非t可以通过吃感染了这种病的面包和啤酒传播，与topic：food里面的te无关，对结论不起作用，不是假设。我觉得这个选项具有迷惑性，因为出现了reasoning当中的元素：bread or beer
总结：假设题重要的还是关注reasoning，才能把握有关无关
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