The ancient Nubians inhabited an area in which typhus occurred, yet surprisingly few of their skelet...

题目信息

The ancient Nubians inhabited an area in which typhus occurred, 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?

A:The tetracycline deposits did not form after the bodies were buried.

B:The diseases other than typhus to which the ancient Nubians were exposed would not be affected by tetracycline.

C:Typhus is generally fatal.

D:Nubian grain became contaminated with tetracycline-producing bacteria prior to being harvested.

E:Bread and beer were the only foods eaten by the ancient Nubians which could have contained tetracycline.

参考答案及共享解析

共享解析来源为网络权威资源、GMAT高分考生等；如有疑问，欢迎在评论区提问与讨论

正确答案： A:The tetracycline deposits did not form after the bodies were buried.

【assumption题】远古N人居住在T病（斑疹伤寒症）发生的区域，然而令人惊异的是在他们的遗骸中很少发现患这种病的证据。遗骸明显显示了tetracycline（四环素）的存在，这种抗生素是在N地土壤中一种细菌生成的。这种细菌可以在干的稻谷中大量繁殖，而这种干稻谷是N人主要的粮食啤酒以及面包的原料。因此认为，食物中的四环素也许可以解释远古N人患T病少的原因。问这个论证的假设是？

A说除了typhus这种疾病，其他某些感染性疾病也会因为tetracycline而对人体失效。无关

B正确。说谷物中的tetracycline在被做成面包和啤酒后对于抵抗typhus这种病，仍然不是没有效果的，即是有效果的，该句双重否定。因此人们吃了还是有抗病的效果。

C说T病不能通过食用含有病菌的面包或者啤酒传播，取非T病能通过被含有病菌的面包或者啤酒传播。原文是说四环素可以减少T病发生，这恰好佐证了面包和啤酒中的四环素能杀死病菌是加强而非削弱，因此不能选。

D项有绝对词only，不优选。另外D说的是面包和啤酒是N人食谱中唯一含有四环素的食品，就佐证了正是四环素杀死病菌

E项是无关选项

笔记