manhattan CR题求解

kangtong1990

For several years,A attracted fewer viewers than B,which broadcasts its how at the same time as A. Recently ,the products of A added personal interest stories and increased coverage of sports and weather. The two programs now have a roughly equal number of views . Clearly ,the recent programming changes persuaded viewers to switch form B to A.

The conclusion above is properly drawn if which of the following is assumed?
(A）the programming content of A is more closely aligned with the interests of the overall audience than is the content of B
(B）Some B viewers liked the new A programming better than they liked B programming
(C）There are other possible causes for an increase in the number of viewers of A ,including a recent as campaign that aired on many local affiliates
(D）The quality of will remain constant even if A improves

kangtong1990

大家有想法就说，畅所欲言哇，楼主26号考试，咱们可以讨论一下解题思路什么的

kangtong1990

(A）The quality of B will remain constant even if A improves 刚刚漏了一个B

macrostrong

个人倾向于选B。 首先我觉得这个题的隐含前提是，A，B viewer的总数没有增加。否则的话，下面的情况都说不通

A：既然A中添加了一些新的节目，而且A,B是在同一个时间段。可能在那个时间段中，A中新添加的节目吸引了B中的一小部分viewer。导致A,B viewer数量一致。

B：使用negation，如果B中没有用户喜欢A的新节目，那就没有人从B切换至A。所以 B是正确。

C：这个削弱了argument

D: 这个也不对，如果A改善了很多，B算然也进步，但是进步程度比不上A，那结论也是成立的。

总之这道题目，CD肯定不对，AB有点纠结，我个人会选B。

kangtong1990

谢谢，这道题昨天想了一下，用negation确实是一个非常好的方法。因为对于author 来说，the assunption(unstated premise) must be true to reach the conclusion.以比较纠结的A 和正确答案B为例为例：if A's content is not more closely aligned with audience than B's content. let's say they are about the same. That doesn' hurt the author's argument all that much.
In contrast. if none of the viewers of B liked A better than B,why would they switch? Negating this will definitely hurts the argument. B it is !