分享一道JJ,及讨论一下假设题的做法.

ohayo

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.
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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.


先说一下我的做法,


1,     肯定句直接看, 否定句取非, 看是否能WEAKEN, 留下相关选项.


2. 有时有两个,谁取非后更能WEAKEN,谁为答案.


单次题的C, 取非后是不能WEAKEN 的, 却是答案.         象这种例外多吗? 能再举几个例子吗?


我只想行成相对固定的做题方法, 和相对周全的思考.


请指教 !!

dansy

C取非是能使原结论瓦解的。C 的意思是说K的有学位的人工资高并不是因为有学位的人少才工资高的。对C取非，所谓物以稀为贵，那么如果以后有学位的人多了，工资就不见得还会高了。


    

jnlvo

同意！取非后肯定能WEAKEN 的，而且我认为并感觉assumption不仅仅取非是个强WEAKEN（那assumption实际就是个强假设），它而是正如dansy所说使原结论瓦解，彻底不成立的，因为assumption是原命题/结论的必要条件。

jnlvo

改正：那assumption实际就是个强支持support

wholly

assumption 答案一般有两种：架桥型和排除他因，很明显c是排除他因啊！其他选项都不对，大多数都是无关项。


或者这样想也可以：假设有degree的人工资为h(high salary),无degree的人工资为l(low salary),有degree的人数为D,无degree的人数为N,这样


    average salary for all workers=(D*h+N*l)/(D+N)


                                                                                                                                                                                                     =(D*h)/(D+N)+(N*l)/(D+N)


现在D/(D+N) 提高了，则前提是上述式子的其他项不至于抵消D/(D+N) 的提高。就按照这样选吧


    


    

wholly

补充一下，就是说c的意思是，D/D+N的提高不会引起h的下降

sunkist

我的理解：



按照lzm书上说的分类，这个是无因即无果。


请指正。

delldell

同意选C

ohayo

是C.


我更想和大家探讨一下考场上的做提方法和步骤. XDF讲的那些理论是对的, 不过是用来讲课用的, 没有太大的实战意义(个人认为).     考试时,提干较长, 如果在考虑那些理论的话,对我来说时间花削有点大.         不知各位在实际做题中是怎样的呢?    

cranberry

？

[此贴子已经被作者于2004-3-20 15:22:10编辑过]