小弟不才，要问问版上大大 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. 陆 B. The diseases other than typhus to which the ancient Nubians were exposed would not be affected by tetracycline. 场 C. Typhus is generally fata. 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. 答案是A，我可以理解，我也能删掉C.D.E三项 但是B(我选B)还是不懂 我的想法是：除了Typhus以外的疾病都不会受到tetracycline 　　　　　　所以Typhus会受到tetracycline影响 感谢～在半个月就要考试了，哎～被GWD搞的真没信心... --

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