GWD -30-Q38很迷惑 可以为我解答吗？

fengxx1110

         GWD -30-Q38  

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.

下载过给出答案选A  ，  但不知道原因？而且与GWD -18-Q 30题目一样，答案细微的差别。就更加糊涂。

NOmoreTears

将A取非

 tetracycline 是 bodies were buried之后才产生 那么 bodies were buried之前的low incidence of typhus 就不能用 tetracycline来解释 跟结论相反

因此A是假设

祝好运！

fengxx1110

  谢谢你的解答！