OG 12 CR-34没看懂

一眼万年

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 identifi ed 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 fi rst 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

cdwayne

paradox: cattles have F syndrome, but chickens don't, while chickens are not immure to the virus that causes F syndrome.

(D) F syndrome takes more than one year to reveal, but the chicken doesn't live so long. (maybe after 10 months the chicken is mature enough to kill. )

CrackingGMAC

Agree with upstair D for sure

wizwiz

F是一种通过infected feed传染的、经常被牛感染的疾病。虽然鸡和牛吃的是同种feed，但是鸡很少被“观察”到感染F。然而这并不意味着鸡对F免疫，因为。。。
A、其他动物感染不感染和鸡对F免疫没有任何联系。。。无关
B、是否有其他让动物得病的途径和鸡对F免疫还是没有任何联系。。。无关
C、C说明了鸡可以对F免疫，和题目要求相反。。。weaken
D、题干中鸡只是没有被观察到感染F，没有说明鸡到底有没有感染。所以这个是对的～
E、如果选择这个那么鸡对F的免疫性就更强了。。。weaken
愚见勿拍砖～