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?
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?
Infectious diseases other than typhus to which the ancient Nubians were exposed are unaffected by tetracycline.
Tetracycline is not rendered ineffective as an antibiotic by exposure to the processes involved in making bread and beer.
Typhus cannot be transmitted by ingesting bread or beer contaminated with the infectious agents of this disease.
Bread and beer were the only items in the diet of the ancient Nubians which could have contained tetracycline.
这道题是一道前果后因题,结果是The ancient Nubians inhabited an area in which typhus occurs, yet surprisingly few of their skeletons show the usual evidence of this disease,原因是:This bacterium can flourish on the dried grain used for making two staples of the Nubian diet, beer and bread. Thus。这种提醒好像假设题一般都可以选项取非削弱来做的:
Infectious diseases other than typhus to which the ancient Nubians were exposed are unaffected by tetracycline.取非后,别的疾病由tetracycline引起,无关。
Tetracycline is not rendered ineffective as an antibiotic by exposure to the processes involved in making bread and beer.刚开始这个选项没读懂,差点漏过去了,tetracycline在做beer后作为抗生素是没有效果的,呵呵,非常好的削弱啦,文中说an antibiotic produced by ……即四环素的作用是作为抗生素,现在说他无用,当然削弱
Typhus cannot be transmitted by ingesting bread or beer contaminated with the infectious agents of this disease.刚开始差点勉强选了这个。取非后,这种疾病可以通过粘上这种疾病的面包和啤酒传播。刚开始想,你不是说tetracycline在“on the dried grain used for making two staples of the Nubian diet, beer and bread”很flourished吗,既然吃了带病菌的啤酒和面包后照样传染,说明tetracycline根本没什么用吗,后来仔细看不对,说的是在dried grain上很flourished,从dried grain到beer还得酿造呢,不是一概念,而且即使传染了,也不能说他没有效果啊。Hehe,ets怎么老师搞这些小聪明,靠我们的月的障碍啊。