GWD题目意思不是很理解，望帮忙，谢谢啦

luyiqing · 发表于 2010-5-13 21:22:25

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？

mousealpha · 发表于 2010-5-14 00:11:42

路过。。

这道题说：牛会感染M，不危险但是造成奶质量下降。M由可抵抗抗生素的SA造成。一种SS可以清除SA，但是SS不会作为解决方案，因为。。。

A里面的certain bacteria跟原文里面的没关系，是指其他的危险的病毒。A说明用SS存在不安全隐患，所以SS不能用。。

B说的是SA抗病毒性是由于以前用抗生素造成的。。跟SS都没关系了。。

楼下继续。。

GWD题目意思不是很理解，望帮忙，谢谢啦

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