求解~！！GWD中一道逻辑题..

yc0428

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.


答案给的是A。。。可是为什么我怎么想都想不明白呢...??为什么是A啊？。。。  请NN指点。。。！！    我是逻辑小白。。。哎。。在挣扎中。。。

counyo

细菌在食物里繁殖，细菌又形成抗生素tetracycline, 然后人吃了食物，身体里就会有抗生素tetracycline，有了抗生素，所以得那种病的概率就低了， 所以骨骼里mei8you发现那种病。

但是如果抗生素tetracycline是在尸体被埋之后形成的，那么人之前体内就没有抗生素，那么就会得那种病，那样会在骨骼里发现这种病。

bdsjb116

assumption题型就把选项的否定带入原文看能不能对结论产生削弱作用

A的否定：tetracydline是在死后才进入人体的，就证明了结论tetracycline in their food probably explains the low incidence of typhus among ancient Nubians不对，因为tetracydline根本就不是来自于food.

yc0428

原来是这样~！我明白了~~
非常感谢！！！

wuyw2010

取非来判断，A如果tetra deposits form after the bodies were buried，那么就不能说明是food里的tetra造成的

流浪的心

这种assumption的题目就可以取非来判断

很简单就得出是A

shencangbulu

这个假设就是排除了T物质是在入土后在体内形成的可能性,也就是说生前体内就有,这样就能抗击原本会得的某病

sunshengkun666

这要按照xdf的宝典，假设题答案为否定句，再排 了七大金刚，5秒出答案啊???

zhangdanqing

七大金刚是哪七大啊。。。