标题: 求助逻辑JJ 34 题 [打印本页] 作者: zjg14430143 时间: 2012-10-18 22:00 标题: 求助逻辑JJ 34 题 第三十四题（细菌和牛奶，因果） 牛感染一种病使得奶的质量不好，这种病由一细菌引起。这细菌给被另外一种干掉。但是不打算用另一种来解决这种病 问原因是什么 By dyf1110 **【考古】 GWD21-Q21 Which of the following most logically completes the passage?
Mastitis is an infection of the udder in cows that, although not dangerous, causes them to give poor-quality milk. Most cases of mastitis are caused by the bacterium Staphylococcus aureus,against which antibiotics are ineffective. However, a related bacterium, Staphylococcus simulans, quickly clears up even severe infections of S. aureus simply by displacing the bacteria. S. simulans is nevertheless unlikely to become the preferred treatment for cases of mastitis, since ______. A certain dangerous bacteria that normally cannot take hold can do so in the presence of S. simulans B the current resistance of S. aureus to antibiotics derives in part from a past pattern of overuse of those antibiotics C the milk from cows infected with S. aureus is generally not of such poor quality as to be entirely unusable D careful farming practice can reduce the incidence of mastitis to a minimum E the only symptom of mild cases of mastitis is the deterioration in the quality of the milk produced 选A？作者: 崔杰铭 时间: 2012-11-25 15:15
我选的b。。作者: gairly 时间: 2012-11-25 15:26
选B： 这种S细菌虽然能消灭另一种细菌,但S毕竟也是细菌,已经有抗药性了. 因此用S来消灭那个已存的细菌不是好方法.