求助一道逻辑题----OG#108

Claudinethj

108  Although custom prosthetic bone replacements produced through a new computer-aided design process will cost more than twice as much as ordinary replacements, custom replacements should still be cost-effective. Not only will surgery and recovery time be reduced, but custom replacements should last longer, thereby reducing the need for further hospital stays.
Which of the following must be studied in order to evaluate the argument presented above?
(A) The amount of time a patient spends in surgery versus the amount of time spent recovering from surgery
(B) The amount by which the cost of producing custom replacements has declined with the introduction of the new technique for producing them
(C) The degree to which the use of custom replacements is likely to reduce the need for repeat surgery when compared with the use of ordinary replacements
(D) The degree to which custom replacements produced with the new technique are more carefully manufactured than are ordinary replacements
(E) The amount by which custom replacements produced with the new technique will drop in cost as the production procedures become standardized and applicable on a larger scale

这个题目我实在不能理解答案C,它到底在说什么. 希望各位好心人能帮帮我. 顺便讲讲这个题目的考题思路. 谢谢~

bettyofariN

成本包括了：手术成本、恢复时间、和“further hospital stays”这三项，每“repeat surgery（重复手术）”一次以上三项成本都要重复一次。新方法在以上三项成本都比旧方法低的情况下，只要新方法在“重复手术”的次数要求上也比旧方法少，那么新方法的总成本就一定比旧方法低了！

Claudinethj

谢谢你的解答,对我理解这题很有帮助,谢谢

之前还在纠结者B还是C的问题.现在觉得有点转过来了, 这个问题的重点是:新方法的cost-saving体现在耐用,减少了重复手术.  
B是比较干扰我的一个选项.B的意思是随着这项新技术的引入, 这个新的手术的材料成本的减少金额. 注意! 这完全是irrelevant选项.

gmat740740

LS说得很全面。+1

C说的是 用新方法（custom replacement）与旧方法在减少重复手术需求上的比较。

bah-torontoer

首先这是个evaluate题，思路是“即要回答新方法为什么好也要说旧方法为什么不如新方法”
首先排除AE 这两选项没有将两者进行比较

接着看BCD 题目可以简写为：
虽然新方法比旧方法贵2倍，但新方法比旧方法还是要节省病人开支(cost-effective)。这由于新方法缩短了手术及恢复时间，并且效果更持久，所以节省了（病人）需要住院治疗的时间。

所以比较新旧方法的关键是看选项中是否对“时间”有说明 所以选C