[求助]陈向东反对题21

amo

    

21. A steady decline in annual movie-ticket sales is about to begin. More than half of the tickets sold last year were sold to the age group under twenty-five years of age, representing twenty-seven percent of the population. However, the number of individuals under twenty-five will steadily decline during the next decade.

Which of the following, if true, casts most doubt on the prediction above regarding future movie-ticket sales?

(D) Movie-ticket sales tend to increase as the size of work force increases, and the size of work force will increase annually during the next decade.

答案：D

为什么D是答案呢？从文中的推理可以得出，结论成立的一个隐含假设就是“25岁一下的那群人超过25岁以后就不经常看电影了”，如果来反对的这个隐含假设的话可能更能起到削弱的作用，不知道我这种说法是不是正确？

同时我认为D中牵涉到了work force，是不是这样的概念（在文中未出现）太过于离谱了？

snow_mountain

这题不是很明显嘛？D说明的是arguer 没有考虑到的情况。


如果你还不明白，请把其他答案帖出来，解释的时候好有个比较。