有一題邏輯問題跟同學討論很久，還是無法理解答案跟題目關聯性 題目: Police found that ninety percent of the burglaries and attempted burglaries ov er a five-year period in the city of Crowther occured in houses that did not h ave burglar alarm system. The police concluded that, in Crowther, the presence of a burglar alarm system is usually effective as a deterrent to burglary. The conclusion reached by the police presupposes which of the following? (A) The burglars entered houses only when they thought the occupants were away or asleep. (B)The burglars entered houses that had burglar alarm systems only when they a nticipated finding particularly valuable goods. (C) When they entered a house that had no burglar alarm system, the burglars c ould take more time to search for valuables. (D) Before they entered a house, the burglars could usually tell whether or no t it had a burglar alarm system. (E) The difference in the burglary rate between houses that had burglar alarm systems and those that did not have remained constant during the five-year per iod 答案是(C)，可是我們覺得(D)的答案比較有關聯性，有請大家幫忙解答了。謝謝 -- Sent from my Android --

※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 101.14.114.138 ※ 文章網址: https://webptt.com/m.aspx?n=bbs/GRE/M.1433401629.A.C8C.html ※ 編輯: genkibb74142 (101.14.114.138), 06/04/2015 15:07:47