标题: 求教OG13 CR的第一道题目，纠结啊～求教 [打印本页] 作者: 隔音耳塞 时间: 2012-8-14 13:47 标题: 求教OG13 CR的第一道题目，纠结啊～求教 Snowmaking machines work by spraying a mist that freezes immediately on contact with cold air. Because the sudden freezing kills bacteria, QuickFreeze is planning to market a wastewater purification system that works on the same principle. The process works only when temperature are cold, however, so municipalities using it will need to maintain a conventional system. 造雪机通过喷撒一层接触到冷空气后立即凝固的薄雾来运作，这种突然的水汽凝固可以杀灭细菌。QF 公司计划销售一种基于这种原理的废水净化系统 。但是由于这种灭菌过程只能在低温下运作，所以运用这种系统的市政机关还是需要维持传统的净化系统。
Which of the following, if true, provides the strongest grounds for a prediction that municipalities will buy QuickFreeze’s purification system despite the need to maintain a conventional purification system as well? 下列哪一项为真时能为这一预计提供最强的支持：尽管市政机关也需要维持传统的净化系统，但它们还是会购买QF公司生产的净化系统？
A. Bacteria are not the only impurities that must be removed from wastewater. 细菌不是唯一需要从废水中去除的污物。
B. Many municipalities have old wastewater purification systems that need to be replaced 很多市政原有的旧废水净化系统需要更新。
C. Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures. 传统的废水净化系统在低温下并不能完全成功地杀灭细菌。
D. During times of warm weather, when it is not in use, QuickFreeze’s purification system requires relatively little maintenance. 天气暖和，QF废水净化系统不使用的时候几乎不需要保养维护。
E. Places where the winters are cold rarely have a problem of water shortage. 有寒冬的地方几乎没有水源稀缺问题。
我的问题是，哪个导致哪个？ 因为传统的系统无法100%在低温下杀菌，但是由于QUICK FREEZE可以，所以政府就会购买QUICK FREEZE，但是为什么还要保留传统的杀菌系统呢（原文中: so municipalities using it will still need to maintain a conventional system）
