TN-19 #29 Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens.Both cattle and chickens raised for meat are often fed the type of feed that transmits the virus that causes the disease.Animals infected with the virus take more than a year to develop symptoms of Lofgren’s disease, however, and chickens commercially raised for meat, unlike cattle, are generally brought to market during their first year of life. Which of the following is most strongly supported by the information provided? A.The virus that causes Lofgren’s disease cannot be transmitted to human beings by chickens. B.There is no way to determine whether a chicken is infected with the Lofgren s disease virus before the chicken shows symptoms of the disease. C.A failure to observe Lofgren’s disease in commercial chicken populations is not good evidence that chickens are immune to the virus that causes this disease. 答案是C。我想请问一下A选项是哪里不对? 另外想请问B选项的错误之处是否是在there is no way 有过度推论之嫌? 恳请大家帮忙解惑，谢谢! --

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