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【GMAT逻辑CR】8807-OG16

浏览次数:180 日期:2017-05-10 14:05:36
Which of the following most logically completes the argument? Ferber's syndrome, a viral disease that frequently affects cattle, is transmitted to these animals through infected feed. Even though chickens commercially raised for meat are often fed the type of feed identified as the source of infection in cattle, Ferber's syndrome is only rarely observed in chickens. This fact, however, does not indicate that most chickens are immune to the virus that causes Ferber's syndrome, since

Which of the following most logically completes the argument?

Ferber's syndrome, a viral disease that frequently affects cattle, is transmitted to these animals through infected feed. Even though chickens commercially raised for meat are often fed the type of feed identified as the source of infection in cattle, Ferber's syndrome is only rarely observed in chickens. This fact, however, does not indicate that most chickens are immune to the virus that causes Ferber's syndrome, since

 A

chickens and cattle are not the only kinds of farm animal that are typically fed the type of feed liable to be contaminated with the virus that causes Ferber's syndrome

 B

Ferber's syndrome has been found in animals that have not been fed the type of feed liable to be contaminated with the virus that can cause the disease

 C

resistance to some infectious organisms such as the virus that causes Ferber's syndrome can be acquired by exposure to a closely related infectious organism

 D

chickens and cattle take more than a year to show symptoms of Ferber's syndrome, and chickens commercially raised for meat, unlike cattle, are generally brought to market during the first year of life

 E

the type of feed liable to be infected with the virus that causes Ferber's syndrome generally constitutes a larger proportion of the diet of commercially raised chickens than of commercially raised cattle


【申友解析】


正确答案:D


题干:F症候群,一种影响到牛群的病毒性疾病,会通过受感染的饲料来传播。虽然商用肉鸡也使用同样受感染的饲料来喂养,但是F症候群在鸡群当中并不常见。这种情况,并不说明鸡群对于该病毒是免疫的,因为______
题目: 逻辑补全
分析:引入他因解释型正向逻辑,要找到说明鸡群同样无法对该病毒免疫的选项。
选项A,鸡群和牛群不是仅有的用被病毒污染的饲料喂养的农场动物,无法解释鸡群不能对该病毒免疫,错误。
选项B,F症候群在未被病毒污染饲料喂养的动物中也有发现,同样无法解释鸡群不能对该病毒免疫。
选项C,对某种病毒组织的抵抗力可以通过暴露接触该传染组织而获得,我们要找的逻辑方向是证明鸡群不对F症候群病毒免疫,该选项讨论的是如何获得免疫力,逻辑方向相反。
选项D,鸡群和牛群通常需要一年以上时间才能表现出感染F症候群的症状,但是鸡群不像牛群,通常在出生一年之内就被上市。这个选项通过引入他因说明了鸡群为何较少表现出F症候群的症状,从而支持了鸡群无法对F症候群病毒免疫的论断。正确!
选项E, 受病毒污染的饲料在鸡群喂养过程中使用比例大于牛群,与免疫与否无关,错误!

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