GWD-28-29<---ethyl更改标题（gwd 28-29） - ChaseDream

28-29: 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.

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.

以下是引用liuyi777在2005-7-24 13:57:00的发言：

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.

我选b 有大牛选c 请指教。

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.

根据题目的意思，我门无法判断除了症状的显现之外还有没有其他的手段来断定ＬＯＦＧＲＥＮ＇Ｓ　ＤＩＳＥＡＳＥ．所以Ｂ不对．

I think why there is a debate between (B) and (c),because some people don't recognize the real question it asked.

The question:Which of the following is most strongly supported by the information provided ?

However, if the question changes: Which of the following most strongly support the argument above?

不选E：原文有“ Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens. ”既然都观察到了，怎么能说“A failure to observe Lofgren’s disease “呢？所以，E不对。

这道题是说：鸡和牛都吃了带有病毒的饲料，可是可以观测到大量的牛得了L，却很少观测到鸡得L，why？因为，一般L的症状要在患病1年以后才显现，而鸡在饲养一年之内往往就被卖出去了。

题目的信息说明了，人们是依靠simptons的检测，观察到动物患L的。在L显出simptons之前，也就是鸡被卖出去之前，是没有方法可以检测出鸡得了L的。（不然人们可以观测得到大量的鸡得病....）

以下是引用josephcfan在2005-9-18 11:41:00的发言：

I think why there is a debate between (B) and (c),because some people don't recognize the real question it asked.

The question:Which of the following is most strongly supported by the information provided ?

That is to say: What can be concluded from the information provided above?

However, if the question changes: Which of the following most strongly support the argument above?

In my opinion ,the answer would be (B).

相当于是从文中可以归纳出什么东西。这样的话B就不合适了。

B其实严格来说算out of scope的吧,文中没有提及the way to determine whether a chicken is infected with the Lofgren’s disease virus 所以怎么就知道没有其他方法能检查出来呢?不显现的病状有可能可以通过其他方法检查出来的嘛...

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.

（此段简而言之，是牛与鸡吃同样传染病毒的饲料，牛发病而鸡未发病是因为发病是在感染病毒一年后，而鸡的寿命不到一年。意指鸡也被传染了病毒但来不及发病便死了）

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.

（B项认为在鸡表现出患病症状之前，无法得知鸡是否感染了病毒。据此推论，既然鸡未表现症状，凭什么说鸡就感染了病毒呢而未表现呢，显然与文章论点相悖）

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.

（此项与文章意思一致，没得病不代表有免疫，不代表没被传染。）

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.

（此项说传染了病毒但没症状的鸡不能传染病毒，本文并没有这层意思，因为对鸡本身来说就存在一个饲料感染问题，彼此之间传染与否都没关系，就是彼此传染了也来不及表现症状。）

E: The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s 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.

Why C implicit that the conclusion is that chickens are immune to the virus that causes this disease, which I cannot deduct from the stated information.

选c 这是结论题。文中说牛有病而鸡没有病。又说都喂了致病的饲料。症状一年后显现。牛饲养超过一年，鸡只有几个月。所以结论应该是尽管没有发现鸡的症状，但是几夜很可能也有病

本题的问题是:supported by the information provided.固是文章支持结论,是归纳题.

文章大意是:牛和鸡都吃了有病毒的饲料，牛有得病的症状而鸡没有,为什么呢?因为鸡都是一年内卖掉的,而症状的出现需要一年.

作者想法是:鸡也是有病的,只是没有足够长的时间来表现症状罢了.

选项C,没发现鸡有病,不是有理的证据来证明鸡对病毒是免疫的.(即,鸡还是有病的)

以下是引用格瑞特艾力在2005-12-17 9:51:00的发言：

本题的问题是:supported by the information provided.固是文章支持结论,是归纳题.

文章大意是:牛和鸡都吃了有病毒的饲料，牛有得病的症状而鸡没有,为什么呢?因为鸡都是一年内卖掉的,而症状的出现需要一年.

作者想法是:鸡也是有病的,只是没有足够长的时间来表现症状罢了.

选项C,没发现鸡有病,不是有理的证据来证明鸡对病毒是免疫的.(即,鸡还是有病的)

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

本来想分析赞成D的，分析分析，却发现在C才是正确的

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.

（此段简而言之，是牛与鸡吃同样传染病毒的饲料，牛发病而鸡未发病是因为发病是在感染病毒一年后，而鸡的寿命不到一年。意指鸡也被传染了病毒但来不及发病便死了）

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.

（B项认为在鸡表现出患病症状之前，无法得知鸡是否感染了病毒。据此推论，既然鸡未表现症状，凭什么说鸡就感染了病毒呢而未表现呢，显然与文章论点相悖）

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.
（此项与文章意思一致，没得病不代表有免疫，不代表没被传染。）

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.

（此项说传染了病毒但没症状的鸡不能传染病毒，本文并没有这层意思，因为对鸡本身来说就存在一个饲料感染问题，彼此之间传染与否都没关系，就是彼此传染了也来不及表现症状。）

E: The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.

[此贴子已经被作者于2005-12-2 17:43:09编辑过]

-- by 会员 wzhyan (2005/12/2 17:32:00)