[求助]prep一道逻辑题。

xiaoxuanchu

In Kravonia,the average salary for the 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.  问题：下面哪个选项weaken了结论。
A）krovonians with more than one college degree earn little more, on average, than do Kravonians with only one 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 Krovonians attending college, the percentage of the population attending college is lower in kravonian than in most other countries
D)In recent years, employers have been requiring college degrees for jobs that were previously performed successfully by Krovonians who did have college degrees.
E) For many years, employers in Krovonians have had difficulties finding enough college graduates to fill the high-paying jobs that were available.
答案是B啦。。虽然得出正选不难。。其它几个选项都太无关了。。可是仔细推敲。。觉得B也有问题啊。就算大学年限增加了。最终（eventually）进入就业市场的有学位的人数仍然会增加的啊。。这些人总归会毕业的吧。。逻辑题不是要注重答案的具体性的么。。还是我钻牛角尖了。。

xiaoxuanchu

In Kravonia,the average salary for the 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.  问题：下面哪个选项weaken了结论。

A）krovonians with more than one college degree earn little more, on average, than do Kravonians with only one 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 Krovonians attending college, the percentage of the population attending college is lower in kravonian than in most other countries

D)In recent years, employers have been requiring college degrees for jobs that were previously performed successfully by Krovonians who did have college degrees.

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

henguc

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

我觉得是因为题目最后把题目的有效时间段限制在over the last few years，如果学校的年限增加到超过了over the last few years就可以weaken了

secretsoft

同问这题B如何削弱结论，不明白

lisney

the problem with this argument is that it takes the observation that "the number of Kravonians enrolled in college has been growing steadily", and takes that observation to mean that the number of graduates is going to increase in proportion.

choice (b) attacks this connection -- if students are taking longer to graduate from college, then the increased enrollment doesn't necessarily mean that there will be any more graduates! it's just a symptom of the fact that students are staying in school for longer.

for instance, if students take 4 years to graduate from college and college graduates 1000 students per year, then (not counting dropouts) that college's enrollment will be approximately 4000 students.
if students begin to take five years to graduate from college, then that same college will begin to have an enrollment of 5000 students -- even if it graduates the same number (1000) of students per year.
也就是说由于在学校呆的时间长了，使得在校人数增加了，但是每年毕业的人数没有增加

Knightll

支持LS

enroll其实不是指一年级新生报到的人数，而是说每学期开学时的注册人数（所有年级的学生）。所以题干里的意思是每学期的在校生变多了。

psycheps

试着解释一下：
前提：Over the last few years, the number of Kravonians enrolled in college has been growing steadily.过去几年，K注册的学生稳步增长。
结论： 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所以，K地进入就业市场的至少有1个大学学位的人最终将很明显高于过去几年。

简化逻辑链：因为注册大学学生多了，进入就业市场的人就会多。

选项：
A. Kravonians with more than one college degree earn little more, on average, than do Kravonians with only one college degree.K具有多个大学学位的人平均挣的比只有一个学位的人只不过多一点。无关。
B. The average number of years Kravonian college students remain enrolled before completing a degree has been increasing over the past several years.K地大学生在完成学位前平均注册年数比过去几年增加了。提到remain enrolled ,有关。
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.尽管K地进入大学的人数增加了，参加大学的人数比例还是比其他国家地，无关。
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.最近几年，K地雇主已经招收大学毕业生，而这些工作以前是由不具有大学学历的人就可以很好完成的。无关。
E. For many years, employers in Kravonia have had difficulty finding enough college graduates to fill the high-paying jobs that were available.很多年以来，K地雇主就很难招收到足够的大学毕业生来满足高薪水的工作。无关。

这里只要懂得Enroll是啥意思就好了，Enroll是注册人数，而不是实际招收人数，如大学招收了1000人，只要他们在学校，他们就要注册，如果在校4年，则注册人数是4000人，如5年则5000人。所以eroll人数增加了，不代表招收学生增加了，也就不代表毕业人数增加了。B正好指出了这个Gap.

echoetmoi

楼上是我看到最棒的解释，释然了