谈谈个人的理解啊，C的核心就在一个scarcity，即workforce with a college degree的稀少不足，也就是说他们这群人的高工资不是由于大学生劳动力的稀少不足，（推论，而在于大学生劳动力的真实能力），因此next four year尽管大学生劳动力的比例会大幅上升，不会影响其含金量。这就是所需的假设。
如果高工资源于大学生劳动力的稀少性，那么今年（比如）有10个大学生，大家的工资是5000一个月，明年，有1000个大学生，稀少性没有了，大家的工资是50一个月，那么实际上，average salary 是没有变化的。
19. In Kravonia, the average salary for jobs requiring a college degree has always been higher than the average salary for jobs that do not require a degree. Current enrollments in Kravonia’s colleges indicate that over the next four years the percentage of the Kravonian workforce with college degrees will increase dramatically. Therefore, the average salary for all workers in Kravonia is likely to increase over the next four years. Which of the following is an assumption on which the argument depends? A. Kravonians with more than one college degree earn more, on average, than do Kravonians with only one college degree. B. The percentage of Kravonians who attend college in order to earn higher salaries is higher now than it was several years ago. C. The higher average salary for jobs requiring a college degree is not due largely to a scarcity among the Kravonian workforce of people with a college degree. D. The average salary in Kravonia for jobs that do not require a college degree will not increase over the next four years. E. Few members of the Kravonian workforce earned their degrees in other countries. Answer: C 虽然我排除了一些选项，但是我不明白C的逻辑，请问谁能帮我解释下C的思路，为什么选C？像C说的，如果市场上不缺有degree的人，那么就算四年内有degree的人增加了，平均工资也不一定会升啊。那C怎么会是假设呢 -- by 会员 茶色的秋天 (2011/9/1 22:07:28)
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发表于 2011-9-1 22:07:28
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楼主
终于明白了。