→ best1yiyi: 謝謝donz大! 每個選項都好清楚!! 01/21 22:22
※ 引述《best1yiyi (yoyo)》之銘言：
: 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。我想請問一下A選項是哪裡不對?
: 另外想請問B選項的錯誤之處是否是在there is no way 有過度推論之嫌?
: 懇請大家幫忙解惑，謝謝!
Drawn Conclusion 的題目，答案取向會比其他題型相對保守
你可以想個簡單的推理，一個事件推原因，可以有許多推論解釋。
但如果是拿到有限的資訊推結果，那當然相對比較無法做過多的結論。
(A) 題目完全沒有 human 的資訊，所以直接刪除
(B) "no symptom" ≠ "can't determine the infection"
沒有 symptom 不代表無法偵測出 infection
所以此題答案不對
這是題目要考你的盲點，這個答案選項為上課時，
同學容易犯的錯誤陷阱選項
(C) 題目資訊為 chicken "no symptom" 是因為時間太早就上市場被吃掉
意思就是 "no symptom" ≠ "no infection"
而 (C) 就是順著邏輯陳述 答案合理
另外，Drawn Conclusion 的確是不喜歡武斷的答案，
所以 B/C 做選擇時，當然是 (C) 相對好。
且 (C) 是否定極端可能性的答案，為保守性的陳述
類似答案如下題:
http://www.manhattanprep.com/gmat/forums/national-budget-and-trade-deficits-t12122.html
但，武斷字不能當成絕對錯誤的原因，如下面此題:
http://gmat.kaomanfen.com/question/e50x0h.html
答案即是以 "nobody" 做開頭
所以基本還是要以相關性先做判題才可
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※ 編輯: ndxica (1.161.152.197), 01/20/2015 12:13:11