求解释陈向东逻辑-weaken

Pythagoras

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 25, representing 27% of the population. However, the number of individuals under 25 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?

A.Medical advances have lowered the mortality rates for those who are forty to sixty years of age.

B.Many people gradually lose interest in going to the movies after they reach 25 years old.

C.The number of movie theaters has been increasing, and this trend is expected to continue during the next decade.

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

E.Experts agree that people under 25 will continue to account for more than half of the total number of tickets sold in each of the next ten years.

答案是D。不理解为什么跟work force有关联，文中没有提及，不是无关信息么。
为什么不是E呢？

chipmunk

weaken 的一个重要方法就是他因，他因法中当然可能会出现新概念了。就本题来说，25岁以下的观众减少，可是如果有其他来源的观众补充，结论A steady decline in annual movie-ticket sales is about to begin，就被weaken了。

可以weaken的题目几乎都会犯一个错误：概念转移。本题结论是说票卖的少了，给的理由却是25岁以下的观众少了。如果有其他观众来源，则25岁以下的观众少了可能不会影响卖票量。

Pythagoras

我明白了，谢谢啦~