CR求指点~

半夏冬忍

Proposed new safety rules for Beach City airport would lengthen considerably the minimum time between takeoffs from the airport. In consequence, the airport would be able to accommodate 10 percent fewer flights than currently use the airport daily. The city’s operating budget depends heavily on taxes generated by tourist spending, and most of the tourists come by plane. Therefore, the proposed new safety rules, if adopted, will reduce the revenue available for the operating budget.
The argument depends on assuming which of the following?
A
There are no periods of the day during which the interval between flights taking off from the airport is significantly greater than the currently allowed minimum.
B
Few, if any, of the tourists who use Beach City airport do so when their main destination is a neighboring community and not Beach City itself.
C
If the proposed safety rules are adopted, the reduction in tourist numbers will not result mainly from a reduction in the number of tourists who spend relatively little in Beach City.
D
Increasing the minimum time between takeoffs is the only way to achieve necessary safety improvements without a large expenditure by the city government on airport enhancements.
E
The response to the adoption of the new safety rules would not include a large increase in the number of passengers per flight.
1.能选出E 但是对C有疑惑
C取反后：减少的是从来不在B城市消费的旅客 那这个减少的影响力就很微弱了 于是削弱了原文 这个思路为什么不对呢？
2.对于数字变化的题目
比如这道：原文是10 percent fewer flights 的数量变化 答案是不是就要想单位量的变化这个方向呢？
求大神指点~谢谢~

spings

我觉得C犯了一个基本的逻辑错误，就是把假设和结论没有分清楚，如果C是假设，假设中已经出现了结论“游客减少可能引致税收减少”，而游客是否减少的假设是什么？并没有真正指出来。

半夏冬忍

我又想了下觉得原文没有说要显著减少 所以应该减少一点也是减少吧

yaya杨

我觉得C是无关项。
我做CR，一般assumption就是直接不看选项先找逻辑漏洞。本题逻辑漏洞就是在于，航班减少不一定旅客减少，tax revenue也不一定减少。所以要填补这个漏洞，直接找能说明旅客数量不会增加的选项。
再来说，C选项呢，旅客的数量和在Beach city相对呆的少的旅客数量，并没有直接关系。试想，Beach city相对呆的少的旅客数量减少，但是并不能说明这个机场旅客数量的问题，机场旅客和spend time in Beach city没有必然关系，因为旅客来自四面八方。

半夏冬忍

yaya杨 发表于 2017-3-29 11:06
我觉得C是无关项。
我做CR，一般assumption就是直接不看选项先找逻辑漏洞。本题逻辑漏洞就是在于，航班减少 ...

嗯嗯有道理~确实C的这两个旅客数量的概念混淆了没注意到@-@ 一个是机场旅客一个是spend time in Beach city 并不是一个圈子里的人。光想着部分和总体的比例关系惹……我发现做CR真的不能太钻牛角尖，掉进自己挖的坑就忽略掉其他的KEY了！！！！
Thank U ~~~~

cuikaka

yaya杨 发表于 2017-3-29 11:06
我觉得C是无关项。
我做CR，一般assumption就是直接不看选项先找逻辑漏洞。本题逻辑漏洞就是在于，航班减少 ...

C选项的SPEND对应的应是原argument结论中"tax generated by tourist spending"，spend是money spend而非time spend，不然C直接就是无关选项了，根本不用讨论。

觉得楼主主要是对结论理解有偏差，结论是"will reduce the revenue available"，这里并没有任何“heavily reduce”之类的修饰词汇。所以C取非后，哪怕只是一小部分人money spend减少了，那么也是减少。OG解释应该也是这个意思。

C选项其实是irrelevant distinction/comparison between people spend much and people spend little.