Housing construction materials give off distinctive sounds when exposed to high temperatures. Acoustic sensors accurately detect such sounds and fire alarms incorporating acoustic sensors can provide an early warning of house fires, allowing inhabitants to escape before being overcome by smoke. Since smoke inhalation is the most common cause of fatalities in house fires, mandating acoustic-sensor-based alarms instead of smoke detectors will eliminate house fire as a major cause of death.
Which of the following, if true, most weakens the argument given?
(A) The present high cost of acoustic-sensor-based alarm systems will decline if their use becomes widespread.
(B) When fully ignited, many materials used in housing construction give off sounds that are audible even from several hundred yards away.
(C) Many fires begin in cushions or in mattresses, producing large amounts of smoke without giving off any sounds.
(D) Two or more acoustic-sensor-based alarms would be needed to provide adequate protection in some larger houses.
(E) Smoke detectors have been responsible for saving many lives since their use became widespread.
logic book style
Premise1：Housing construction materials give off distinctive sounds when exposed to high temperatures.
Premise2：Acoustic sensors accurately detect such sounds
Premise3：and fire alarms incorporating acoustic sensors can provide an early warning of house fires, allowing inhabitants to escape before being overcome by smoke.
Premise4：Since smoke inhalation is the most common cause of fatalities in house fires
Conclusion：mandating acoustic-sensor-based alarms instead of smoke detectors will eliminate house fire as a major cause of death.
前提三是用and去跟前提二劃分的，因為他們是並列邏輯，但也是可以當作同一個大句子。
中文對照：
前提一：物質高溫有不同聲
前提二：ＡＳ可以偵測到
前提三：ＦＡ＋ＡＳ＝發煙前可逃
結論：ＦＡ＋ＡＳ＝消滅火災死因
分類完之後就是找連貫性（coherence）：聽音逃難
然後題目問weaken這個削弱的意思就是想辦法將整個argument變成爛的argument，所以可以有以下質疑處，可以詢問前提是否為真，結論是否有反例出現，基本上這兩招吃遍所有加強跟削弱題，換湯不換藥。
選項：
(A) The present high cost of acoustic-sensor-based alarm systems will decline if their use becomes widespread.
本篇是一個警報器用在火災案發現場的故事，這個不是在做市場調查，也不是上經濟學的課，看到costco的弟弟cost基本上就可以說：下一位
(B) When fully ignited, many materials used in housing construction give off sounds that are audible even from several hundred yards away.
可惜hundred yards away.造成連貫性不對，由前提一就可以知道討論內容不是遠近，而是辨音。
(C) Many fires begin in cushions or in mattresses, producing large amounts of smoke without giving off any sounds.
有些東西燒起來是『有煙』『沒音』的，這跟前提一描述相反了，剛好當作結論的反例，達成削弱目的，
這種歸納類的題型就是只要從一開始的前提一直到結論，中間沒有任何差錯，從上推到下，從一推到結論，中間是一直連接的，這樣才有可能是可有效且好的論辯，假設中間任何一句話被推翻，這個歸納就存在，這樣就達到weaken的效果，在簡單一點就是，物質高溫有不同聲→ＡＳ可以偵測到→ＦＡ＋ＡＳ＝發煙前可逃→ＦＡ＋ＡＳ＝消滅火災死因，當中只要一個箭頭對不過去下一個關卡，這就是weaken
這類似數學歸納法的處理方式，
當n=1時，3n+1 = 4，不是3的倍數，這時候你可以想成前提一
當n=2時，3n+1= 7，也不是3的倍數，這時候你可以想成前提二
我假設 n=k 也不是3的倍數是成立的，這時可假設前提三
那麼我 n= k+1的情況之下，不是3的倍數必定也會成立，這個就是結論
所以以上如果有個n算出來是3的倍數，這組數學歸類就會無法得証
選（Ｃ），以下就let it go
(D) Two or more acoustic-sensor-based alarms would be needed to provide adequate protection in some larger houses.
單位面積內要放幾顆偵測器顯然已經離題了
(E) Smoke detectors have been responsible for saving many lives since their use became widespread.
以上文章完全沒有Smoke detectors 單獨出場solo的時候，所以主詞不對，內容也離題了
我認為GRE的錯誤選項是定義上的問題，角色扮演上的錯誤，而不是翻譯內容上的瑕疵讓他產生錯誤，所以要從定義著手才是王道，以上個人筆記希望有幫助到大家，文章內容中英夾雜請見諒，有誤再請指教!!
托福TOEFL ibt (4)