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题库 / GMATLA-CR-75
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 ______.
certain dangerous bacteria that normally cannot take hold can do so in the presence of S. simulans
the current resistance of S. aureus to antibiotics derives in part from a past pattern of overuse of those antibiotics
the milk from cows infected with S. aureus is generally not of such poor quality as to be entirely unusable
careful farming practice can reduce the incidence of mastitis to a minimum
the only symptom of mild cases of mastitis is the deterioration in the quality of the milk produced
mastitis大多数情况下由SA引起，抗生素对SA没有用。现在一种类似的细菌SS可以快速通过替换掉SA的方式来消除影响，然而SS不太会被当成mastis的治疗方法。因为___
A选项：certain dangerous bacteria that normally cannot take hold（抓住，固定） can do so in the presence of S. simulans某些危险的细菌在正常情况下无法站稳，但在模拟链球菌存在的情况下却能做到
某种平时不能take hold的危险的菌在Ss出现的情况下可以take hold了——意思是说，虽然Ss能够消除infection，但同时又引来某种dangerous bacteria，可能得不偿失，所以不用Ss--- 摘自CD。correct，方案的副作用
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