GWD 18-Q30

Pythagoras

(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?

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.

Answer: B

这里的C选项是啥意思呢？？没看明白啊 嘻嘻谢谢～～～

pfullsomer

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

关于C选项我觉得可以用sdcar大神的negate的方法来排除。 C项如果取反的话 是说Typhus CAN be transmitted by ingesting bread or beer contaminated with the infectious agents of this disease. 可是就算是beer和bread里含有Typhus又能怎么样呢，不还有Tetracycline可以抵抗typhus么？ 如此推断即使没有C项也不会对结论有什么影响。

Pythagoras

我基本明白了
可是还有个小问题：文中从来没有说过Tetracycline可以预防typhus啊？？？！！！

youngerlee

古代在N这个地方有伤寒发生，奇怪的是却很少有遗骨显示这种疾病的证据。  遗骨显示了一种普遍存在于N土壤的细菌产生的抗体的沉积。 这种细菌能是做两种主食的谷物生长茂盛。因此，食物中的抗体可以解释伤寒发生概率低的原因。问前提是什么？


哦，顿悟！其实题目是这样的，这种抗体可以抵御伤寒，所以伤寒的发生率低了，而B就是这个假设：加工过程不会导致抗体失效。

Pythagoras

啊 转过弯来了。。嘻嘻谢同学：）

pengyayun

typus是一种病，tetracycline是抗生素.  

1、前面两句只是给出了信息： ancient Nubians skeleton反映出较少得病，却有抗生素。  

2、（1）细菌产生抗生素 （2）细菌能在粮食上生长  ==〉抗生素在粮食上

   （3）粮食用于做啤酒和面包

3、食物里的抗生素是病少的原因

前提就是抗生素在粮食被做成食物（啤酒和面包）时他的抗病作用不会被破坏

C 选项 病在吃啤酒和面包时不传染  显然无关，体会一下。。。