[問題]GWD28-29

[ariesmilla]

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.
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.

選項C說證據無法顯示肉雞對virus免疫，但我不覺得題目和有關聯。

題目只說牛比雞更容易觀察到感染L病
而問題問的是support，
B可以加強因為沒有方法可以在雞賣出之前檢查雞有這個病，
也就是即使雞有L病，因為它症狀還沒顯現就賣掉了，
所以發現的病例比牛少。
所以支持阿

請指教...

[維尼]

本題不是問支持推論
是問題目資訊可以支持(推論出)哪一個答案選項

[ariesmilla]

阿(驚!!!!)
對不起大家...我笨了......

[yellowten]

我不太種為什麼可以推出C的結論耶
題目的observe是觀察發現的意思嗎?

我的理解是這樣
1.觀察到牛比雞容易有L病
2.牛雞吃的食物有傳染L的病毒
後面說的症狀 一年 答案都沒有用到先不要管他


可是這樣子為什麼就可以推出C?
是怎麼從文章中推出來的呢?



感覺E反而可以推耶
你們幫我看看一下喔

他說牛雞吃的食物並不是唯一病毒的來源
表示=>有其他來源
=>或許牛接觸到了別的來源或雞會接觸到不同來源
=>可以解釋牛有L病>雞有L病


這樣子的想法哪裡有錯誤呢?

[chour]

我不太種為什麼可以推出C的結論耶
題目的observe是觀察發現的意思嗎?

我的理解是這樣
1.觀察到牛比雞容易有L病
2.牛雞吃的食物有傳染L的病毒
後面說的症狀 一年 答案都沒有用到先不要管他

其實要回答出C的答案,要用到這段話唷!!
題目是說,牛常常被發現有L病,而很少發現雞有L病,
被L病病毒感染的動物,要經過一年才會出現相關症狀,
而雞通常養不到一年就會被抓去賣了
==>也就是說,就算雞染病了,也沒有症狀(因為不到一年),很難被發現
結論:沒發現雞染病,並不代表雞對L免疫(而是症狀還沒出現啦!!)
可是這樣子為什麼就可以推出C?
是怎麼從文章中推出來的呢?



感覺E反而可以推耶
你們幫我看看一下喔

他說牛雞吃的食物並不是唯一病毒的來源
表示=>有其他來源
=>或許牛接觸到了別的來源或雞會接觸到不同來源
=>可以解釋牛有L病>雞有L病

這樣子的想法哪裡有錯誤呢?
這樣反而忽略了題目中一直重申的"一年"的因素唷!!

[antimissle]

想請教一下~

這樣不能推出B嗎?
chicken很少被檢查出有該病, 因為潛伏期為一年,
而在一年內雞就被抓去賣了.
所以說, 在發病前沒辦法查出牠有病阿????

[A級垂耳兔]

想請教一下~

這樣不能推出B嗎?
chicken很少被檢查出有該病, 因為潛伏期為一年,
而在一年內雞就被抓去賣了.
所以說, 在發病前沒辦法查出牠有病阿????

誰說"沒辦法"?
文章哪裡提到咯雞在出現徵狀之前沒有辦法檢驗是否染病?
文章從頭到尾都沒提到如何檢測疾病...我當然也可以說"有辦法"在發病前檢驗...
只是"來不及"檢驗就抓去賣了....
"有沒有辦法"檢驗和"來不來得及檢驗"是不一樣的~~~

[chris8888]

我認為答案應該是D, 理由如下
===================================================================================
我認為答案應該是兩個之間的抉擇
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. 未能去檢驗商業買賣上雞隻族群的L疾病並不是一個很好的證據, 此證據說雞隻對造成L疾病方面是免疫. 既然不是個好證據說明雞隻免疫, 那麼還敢上市去賣雞肉嗎?
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.
一個動物不會傳播疾病到一個未受感染的相同物種, 而此動物已經感染L疾病卻沒有發展出症狀 <== 這是結論, 被文章所支持, 文章提及雞隻ㄧ年內就賣到市場上去了且症狀來不及產生, 既然來不及產生就被殺來賣. 也不會傳染,, 不正好是一個事實支持著D的選項. 文章提供的資訊, 正好解釋著D選項.

[阿琪]

我認為答案應該是D, 理由如下
===================================================================================
我認為答案應該是兩個之間的抉擇
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. 未能去檢驗商業買賣上雞隻族群的L疾病並不是一個很好的證據, 此證據說雞隻對造成L疾病方面是免疫. 既然不是個好證據說明雞隻免疫, 那麼還敢上市去賣雞肉嗎?
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.
一個動物不會傳播疾病到一個未受感染的相同物種, 而此動物已經感染L疾病卻沒有發展出症狀 <== 這是結論, 被文章所支持, 文章提及雞隻ㄧ年內就賣到市場上去了且症狀來不及產生, 既然來不及產生就被殺來賣. 也不會傳染,, 不正好是一個事實支持著D的選項. 文章提供的資訊, 正好解釋著D選項.

(d))
not developed symptoms cannot transmit the disease
已經感染了，症狀沒產生…就代表不會傳染嗎？？文章裡好像沒說Lofgren有這種特性

uninfected animal of the same species
文章好像根本就沒在談這個喔！

(d)並非正確的選項！

以上參考

[chris8888]

29: Lofgren’s disease has been observed frequently in commercially raised cattle but very rarely in chickens.(在雞身上病毒較不易被觀察到) 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. (雞隻不到一年, 通常在一年之內就被抓到市場賣掉)

Which of the following is most strongly supported by the information provided? 找支持 : 不能被觀察到有病毒, 不代表真的免疫(暗示 : 很可能並非免疫, 而是尚未發病)

A: The virus that causes Lofgren’s disease cannot be transmitted to human beings by chickens.
無關能不能被傳染給人類
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.
無關有沒有方法可以決定 ...
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.
未能觀察到商業雞隻的病毒不是一個很好的雞隻免疫於病毒的証明. 因為題目提到一年內賣掉, 所以可能在尚未發病就被賣掉, 因此這句話可以支持極度可能是雞隻沒有免疫, 只是早被賣掉, 因此未能觀察到雞隻身上的病毒並不是好的證據說明雞隻免疫於此病毒 (support by information provided, Correct answer)
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.
無關能不能傳染給未受感染的同種動物
E: The feed that chickens and cattle are fed is probably not the only source of the virus that causes Lofgren’s disease.
是不是唯一的飼料來源不是重點