问一道机考题

The ancient Nubians inhabited an area in which typhus occured, yet surprisingly few of their skeletons show the usual evidence of this disease. The skeletons do show deposists of tetracycline, an abtibiotic produced by a bacterium common in Nubian soil. This bacterium can flourish on the bried grain used for making two staples of Nubian diet, beer and bread. Thus, tertracycline in their food probably explains the low incidence of typhus among ancient Nubians.

A. the tertracycline deposits did not form after the body were buried.

B.Thediseases other than typhus to which the ancient Nubians were exposed would not be afffected 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 tertracycline.

这道题我选了Ｃ，因为要从骨骼中发现风寒的证据，那么这个骨骼的主人应该是得风寒死的，要不然风寒好了，就看不出来了．

而答案是Ａ，　我怎么也想不通，如果尸体烧掉，这种　tertracycline deposits 就不存在了，那怎么在骨骼中显示出来呢？

不知道题是什么,是问assumption么?

buried是埋不是烧,题目说的是,skeletons 有deposists of tetracycline,然后tetracycline又存在主食里面=>食物里面tetracycline解释不得T病

A说:tetracycline不是尸体埋了过后产生的(因为tetracycline是在soil里,有理由怀疑这点)

所以A是排除了这个因素

Thank you for your help!

不过还是对Ｃ有些不理解．．．．．．

能不能解释一下