标题: OG 12 CR-34没看懂 [打印本页] 作者: jerryjay 时间: 2011-11-9 07:05 标题: OG 12 CR-34没看懂
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作者: sxf112233 时间: 2011-11-9 22:05
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. )作者: vespertine612 时间: 2011-11-10 06:27
Agree with upstair D for sure
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