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感觉很典型的充分必要推理,但是就是这一类型的搞不清楚,希望高手指点下解题的思路. 1.Ann will either take a leave of absence from Technocomp and return in a year or else she will quit her job there, but she would not do either one unless she were offered a one-year teaching fellowship at a prestigious university. Technocomp will allow her to take a leave of absence if it does not find out that she has been offered that fellowship, but not otherwise. Therefore, Ann will quit her job at Technocomp only if Technocomp finds out she has been offered the fellowship. Which one of the following, if assumed, allow the conclusion above to be properly drawn? A. Technocomp will find out about Ann being offered the fellowship only if someone informs on her. B. The reason Ann wants the fellowship is so she can quit her job at Technocomp. C. Technocomp will not allow any of its employees to take a leave of absence in order to work for one of its competitors. D. Ann will take a leave of absence if Technocomp allows her to take a leave of absence. E. Ann would be offered the fellowship only if she quit her job at Technocomp.
2.Any person who drop out of high school will be unemployed, unless he or she finds a low-paying job or has relatives with good business connections. Which of the following could not be drawn from the statement above? A. Any person who drop out of high school , will be unemployed, have a low-paying job, or have relatives with good business connections. B. Any high school dropout who has neither a low-paying job nor relatives with good business connections will be unemployed. C. Any employed person who has neither a low-paying job nor relatives with good business connections is not a high school dropout. D. Any high school dropout who has a job that is not low-paying must have relatives with good business connections. E. Any person who has relatives with good business connection and who is not a high school dropout must be employed at a job that is not low-paying.
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发表于 2007-12-6 23:19:00
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