这道题是陈向东编的GMAT逻辑推理 书中的，因为找不到有关这本书中题目的讨论，所以新开一贴，麻烦nn们帮忙解释下。
P503
10. A recent survey showed that 50 percent of people polled believe that elected officials should resign if indicted for a crime, whereas 35 percent believe that elected officials should resign only if they are convicted of a crime. Therefore, more people believe that elected officials should resign if indicted than believe that they should resign if convicted.
The reasoning above is flawed because it
A. draws a conclusion about the population in general based only o a sample of that population
B. confuses a sufficient condition with a required condition
C. is based on an ambiguity of one of its terms
D. draws a conclusion about a specific belief based on responses to queries about two different specific beliefs
E. contains permises that cannot all be true
答案是b, 我选了a
实在想不通b所谓的充分条件，必要条件是怎么对应文中的推理？作者: viviansecret 时间: 2013-1-2 07:03
indicted for a crime（被起诉）是be convicted a crime（被定罪）的必要条件。一定是先被起诉，再被定罪。所以原文有问题。前提是35%认为官员应该辞职ONLY IF他们被定罪，到了结论ONLY IF没了，那么，认为被定罪该辞职的人，就应该是50％＋35％＝85％，因为认为起诉就该辞职的人，当然认为被定罪的该辞职。那么，实际结论应该与原文结论相反。
