[求助]新prep2-121

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.  Over the last few years, the number of Kravonians enrolled in college has been growing steadily.  Therefore, the number of Kravonians entering the job market who have at least the qualification of a college degree will eventually be significantly higher than it has been over the last few years.

Which of the following, if true, most seriously weakens the argument?

A. Kravonians with more than one college degree earn little more, on average, than do Kravonians with only one college degree.

B. The average number of years Kravonian college students remain enrolled before completing a degree has been increasing over the past several years.

C. Despite the increase in the number of Kravonians attending college, the percentage of the population attending college is lower in Kravonia than in most other countries.

D. In recent years, employers have been requiring college degrees for workers in jobs that were previously performed successfully by Kravonians who did not have college degrees.

E. For many years, employers in Kravonia have had difficulty finding enough college graduates to fill the high-paying jobs that were available.

answer:B

知道其他选项都可以排除，但是完全不明白B是怎么削弱的....呼唤呼唤解答者~~~~~~

题目说过去的几年进入大学的人多了 于是就说职业市场上有大学学位的人会比几年前大幅增加

B 说前几年入学的人毕业的平均年限在不断增加 也就是说那些人毕业的时间被推迟了 所以他们进入职场的时间也自然推迟了

所以削弱大幅增加这个结论

哦 那这道题的切入点是时间喽？可是觉得时间这个提示不太明显 现在被推迟了 将来还是会大幅增长呀 还是will的呀  我是不是有点钻牛角尖了...

再顶~

是钻牛角尖了

削弱不是说要你证明 结论为非 只要降低结论成立的可能性就算削弱