标题: GWD题目意思不是很理解，望帮忙，谢谢啦 [打印本页] 作者: luyiqing 时间: 2010-5-13 21:22 标题: GWD题目意思不是很理解，望帮忙，谢谢啦 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 答案是A，但是我觉得A说certain bacteria，并没有说是原文提的那个bacteria，是不是无关啊？我选B，感觉也怪怪的，到底怎么分析啊？这道题什么意思啊？作者: mousealpha 时间: 2010-5-14 00:11
路过。。