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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 ______. - 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
正确答案是A，为什么为什么？？？ 当时选B的时候，我还自我感觉无比良好的在旁边写了批注，我觉得B的意思就是SS虽然对SA很有效，但是将使得以后的细菌抗药性更强，故而不能用~~~一切不是很完美，很和谐吗？ A为什么对啊，想不通额， 完全是支持，没有任何削弱嘛……
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发表于 2009-3-15 20:08:00
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