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131、病毒和牛奶产量(GWD变体)
V1 from 西门吹鸟
还有一题说是两种病毒,一种使牛产奶下降,另一种可以杀死前一种,所以科学家建议采用第二种去杀死前一种,问假设。
GWD 21-Q21: 感谢cutewen提供,注意是变体!
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(Answer)
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
西门吹鸟: 不是原题,是变体,前提大概一样,不过最后说Ss 可以用来消除Sa,问作者的假设 |
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