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 severeinfections 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 这题答案是A，我当初写A是因为其他都被我删光了所以才选这个答案。 想请问各位高手这A选项的翻译到底要怎麽解释会比较好阿? 谢谢~ --

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