请教各位一道裸机题，是在没想懂

astronautking

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.

clumsy123

选D的吧？

cdwayne

(C) 取非反駁原文

clumsy123

The premise is that  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.

then, the argument concludes that since the percentage of the Kravonian workforce with college degrees will increase dramatically, the average salary for all workers in Kravonia is likely to increase.

So, it should rule out the possibility that "The average salary in Kravonia for jobs that do not require a college degree will not increase over the next four years", so that it can properly draw the conclusion that the increase of the average salary is due to the increase of people with college degrees.

astronautking

选D的吧？

-- by 会员 clumsy123 (2011/4/25 21:04:46)

我选的也是D，答案是C！

astronautking

(C) 取非反駁原文

-- by 会员 cdwayne (2011/4/25 21:11:33)

求详解

clumsy123

(C) 取非反駁原文

-- by 会员 cdwayne (2011/4/25 21:11:33)

求详解

-- by 会员 astronautking (2011/4/25 21:13:40)

啊~~同求详解！！！

clumsy123

我明白了，是选C，如果对D取非是不能削弱原结论的，就算没有大学学历的人的平均工资也涨了，那么肯定不会影响对总平均工资的增长。

而C是说高学历有较高的工资不是因为这些高学历的人太少的缘故。取非的话，也就是说高学历有高工资是因为这种人少，那么原argument说随着高学历的人增多，平均工资就不一定会增长

cdwayne

樓上正解！謝謝！

astronautking

我明白了，是选C，如果对D取非是不能削弱原结论的，就算没有大学学历的人的平均工资也涨了，那么肯定不会影响对总平均工资的增长。

而C是说高学历有较高的工资不是因为这些高学历的人太少的缘故。取非的话，也就是说高学历有高工资是因为这种人少，那么原argument说随着高学历的人增多，平均工资就不一定会增长

-- by 会员 clumsy123 (2011/4/25 21:20:18)

Got it! 但是对C取非：没有大学学历的人的平均工资也涨了为什么肯定不会影响对总平均工资的增长呢？