请教一题新prep1-108

逆时桢

118.(30900-!-item-!-188;#058&005643)(GWD 18-Q30)



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?

假设

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

B. Tetracycline is not rendered（报答，呈递，演出） 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（把xxx弄脏） 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.



A：其他疾病，无关选项，大金刚。

B取非：T（抗体）被呈现出无效，（这就够了，T无效，它的出现和得不得T病无关）作为一个在制作B和B时被暴露的抗体。

C取非：T病会在吸收已被传染性中介弄脏的B或B的时候被传播。（被传播并不一定得病呀，题目中的gap是T和T，此项不含有）

D：only，不选，无法取非

E无关





答案选B，我本来选了C，说实话第一次做的时候没有真正弄懂。
上面是我自己牵强的解释，但是还是无法说服自己B为什么对而C为什么错，求NN解答！！！

法兰克福来客

我不是很理解楼主为什么把B和C选项都取非，我觉得，gap在于tetracycline会出现在人类的食品中推出人类骨骼中很少出现这种疾病，所以前提就是这种tetracycline是种有用的抗体。

逆时桢

lz取非的原因是这是假设题的常用做法，不过谢谢你的提醒，得到了很大的帮助，题目中有些前提是可以默认的

coolhaoming

将B取非后：通过暴漏在制作啤酒和面包的过程中，T作为一种抗生素是无效的。这就削弱了题干