GWD-18-30

michael_wind

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

E.Typhus is generally fatal.无关


B我能够明白，但是C怎么理解呢，我觉得也可以作为假设

staren21cn

通常像这样A原因导致B结果的assumption的题，都是要排除它因，就是不会有别的原因导致

B结果。选项B就是间接的说了不是别的原因。至于这个病是怎么传播的与主题无关，主题只是

要找出为什么这个病没有出现。

michael_wind

我认为这里是gap，不是排除他因。原因我在ls说了

natalietong

现象：N生活在t出现的地方但是少有得t病 ，N的骨骼表明有te，te在用于做food的干的谷物上有  结论：在food里面的te解释了t的低出现

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