请教GWD18-Q18

bdx2010

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            GWD-18-Q30（答案是B，可我没看明白~请NN来给看看，非常感谢）

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.

lijiahui0422

这题应该有了讨论帖子吧...

题目说一种病ty在N人住的地方有，但是但是这些n 人却没发现得过这种病（骨头里没有迹象），骨头里却有一种的抗体te，这些te存在于做食物的grain里面，结论是，food里面的抗体解释了为什么人们不得这个病

assumption:B证明这个推论的可行性，因为这个抗体在事物的制作过程中不会失效，所起才能起到抗体的作用

bdx2010

谢谢啦