※ 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 -- Donz 2015 1月全科機經班: http://ppt.cc/wwcn Donz + Keewee 四週速成實力三月班: http://ppt.cc/2oGt Donz GMAT FB: https://www.facebook.com/groups/DonzGMAT --

※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 1.161.152.197 ※ 文章網址: https://webptt.com/m.aspx?n=bbs/GMAT/M.1421727038.A.E8E.html ※ 編輯: ndxica (1.161.152.197), 01/20/2015 12:13:11