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 temperatures are cold, however, so municipalities using it will still need to maintain a conventional system.

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?


Bacteria are not the only impurities that must be removed from wastewater.

Many municipalities have old wastewater purification systems that need to be replaced.

Conventional wastewater purification systems have not been fully successful in killing bacteria at cold temperatures.

During times of warm weather, when it is not in use, QuickFreeze's purification system requires relatively little maintenance.

Places where the winters are cold rarely have a problem of water shortage.

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情景：造雪机的原理可以应用于消灭细菌。这个造雪机的公司因此打算推广一款应用同原理的污水过滤系统。由于这个系统仅仅在冷天有效，所以市政局还得保留一个传统的净水系统。

推理：本题的结论句其实藏在问题中，即，市政局依然决定买一个净水系统。由于整体的结论是一个方案，因此本题为方案推理。
目标：为了净化水
方案：买一款应用造雪机原理的净水系统。

选题方式：方案推理有三个评估方向，简而言之，即，答案选项一定和方案的内容相关。

选项分析：

A选项：细菌并不是唯一的需要过滤掉的杂质。本选项没有提及方案的信息。

B选项：很多市政局有需要替换的老旧净水系统。本选项没有提及方案的信息。

C选项：Correct. 传统的净水系统在寒冷的天气是的除菌效果不好。本选项看似没有直接提及方案，实则给出了本方案的可行性，即，寒冷天气中我们需要这个新型的净水系统。属于CQ1：方案的可行性问题。

D选项：在天气暖和时且不用时，这个新型的系统需要极少的维护。本选项给出的是该方案的额外好处，不属于方案推理的三个评估方向（不是否定性副作用，由这个评估方向提出的加强需要否定一个潜在的副作用，而不是说一个优势）。

E选项：冬天很冷的地方很少有水源缺乏的情况。本选项没有提及方案的信息。

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