Q29: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.
D. An animal that has been infected with the virus that causes Lofgren’s disease but that has not developed symptoms cannot transmit the disease to an uninfected animal of the same species.
E. The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.
答案C，我觉得是B
Q28:Which of the following most logically completes the argument?
A certain cultivated herb is one of a group of closely related plants that thrive in soil with high concentrations of metals that are toxic to most other plants. Agronomists studying the herb have discovered that it produces large amounts of histidine, an amino acid that, in test-tube solutions, renders these metals chemically inert. Possibly, therefore, the herb’s high histidine production is what allows it to grow in metal-rich soils, a hypothesis that would gain support if ______.
A. histidine is found in all parts of the plant—roots, stem, leaves, and flowers
B. the herb’s high level of histidine production is found to be associated with an unusually low level of production of other amino acids
C. others of the closely related group of plants are also found to produce histidine in large quantities
D. cultivation of the herb in soil with high concentrations of the metals will, over an extended period, make the soil suitable for plants to which the metals are toxic
E. the concentration of histidine in the growing herb declines as the plant approaches maturity
答案E,成熟了就不会被poison了？
29B. 从哪里看出there is no way呢? 整文无任何关于怎样determine的信息.
28. I vote for D. please see 19楼 at http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=140380&star=2&page=
Q29:Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens.
因为出现发病症状要1年，but very rarely in chickens，因为他们通常第一年就被杀了卖了，是否可以说明杀了卖了之前virus 是有的，但是人们在它们发病之前查不出来是否会发病，然后就卖了它们。frequently in commercially raised cattle，是因为cattle通常活年以上发病了才observe,而不是发病前就有办法看出是否有virus并且会1年后发病。
gwd-28-29我认为是b
q28我认为是a, 对应文中说产生large amounts of H
２９题严重支持Ｃ。Ｂ不对，理由见上面。B 说判断不了有病/无病，全篇那里有这么说过？？？
Ｃ对，因为可以得出－－－－〉商业鸡其实到死都不可以“观察”的出是否有病/无病，因为1年就杀了，还没有来得及“观察”的出。
观察 不等于 DETERMINE。因为不排除有其他方法可能/或者不可能 监测出有病/无病，比如抽血。
C
B是support原文结论，我们暂且把文章第一句话当作结论。
C其实是一个evaluate，评价原文的逻辑缺陷，如果这个题原文问：what is the false of the logic of the reasoning above ，那么大家一定是选C：说从观察不到疾病不能说明不带病毒
补充：这个题其实和通常的support题型不同在于不是由原文内容推出一个结论，准确地说这个题是问由原文的荒谬推断我们可以说明什么道理
29答案是C：
28答案是E:
CQ29
一定要根据事实做这类归纳题,B其实是一个推断,C才是文章所陈述的事实
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