题目信息
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
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已选答案：
正确答案：
A:certain dangerous bacteria that normally cannot take hold can do so in the presence of S. simulans
原文说sa可以消除ss（这个东西让牛的病），但是sa不是一个消除ss的好办法，为什么？
选项要找：sa因为什么特质..所以不能作为消除ss的办法
A 有些病菌正常情况下不能生存，有了ss就能生存了。正确
B 说sa的抗性问题 无关
C 说牛奶的质量问题 无关
D 说什么可以降低疾病的发生 这不能解释sa为啥不能用来作为消除ss的方法。
E 问题牛奶的特征 无关
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