GMAT申友逻辑CR题库-The ancient Nubians inhabited an area in which typhus occurs, yet surprisingly few of their skeletons show the usual evidence-破解版08-真题答案解析

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CR45-55题

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?

A. Infectious diseases other than typhus to which the ancient Nubians were exposed are unaffected by tetracycline.

B. Tetracycline is not rendered ineffective as an antibiotic by exposure to the processes involved in making bread and beer.

C. Typhus cannot be transmitted by ingesting bread or beer contaminated with the infectious agents of this disease.

D. Bread and beer were the only items in the diet of the ancient Nubians which could have contained tetracycline.

E. Typhus is generally fatal.

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答案：

人们食物中

的tetracycline是人们很少得typhus 这个病的原因。问假设，目的是要增强结论 A选项：除了typus这种疾病，其他某些感染性疾病也会因为teracycline而对人体失效。无关。 B选项：谷物中的teracycline在被做成面包和啤酒后对于抵抗typus这种病，仍然不是没有效果的，即是有效果的，该句双重否定。正确。因此人们吃了还是有抗病的效果。 C选项：out of scope，无关 D选项：这个无加强作用。 E选项：这个没有用。