题目：
In surveys Mason City residents rank water sports （swimming， boating， and fishing） among their favorite recreational activities. The Mason River flowing through the city is rarely used for these pursuits， however， and the city park department devotes little of its budget to maintaining riverside recreational facilities. For years there have been complaints from residents about the quality of the river's water and the river's smell. In response， the state has recently announced plans to clean up Mason River. Use of the river for water sports is， therefore， sure to increase. The city government should for that reason devote more money in this year's budget to riverside recreational facilities.
Write a response in which you examine the stated and/or unstated assumptions of the argument. Be sure to explain how the argument depends on these assumptions and what the implications are for the argument if the assumptions prove unwarranted.
中文翻译：
调查显示m市的老百姓把水上运动（游泳，划船及垂钓）作为最受欢迎的娱乐活动。贯穿m市的M河很少被用于水上运动，然而城市公园部门很少投入资金去维护沿河的活动设施。这么多年居民们一直投诉河水的质量及味道。为了回应这一投诉，当局最近宣布了清理M河的计划，因此M河的水上活动使用将会增加。所以市政府应该增加对河岸活动设施的资金投入。
写一篇回应，在其中检视文章的论证中述及和/或未明确述及的假设，务请解释文章的论证是如何依赖于这些假设的，并指出如果这些假设不成立会对文章的论证带来何种影响。
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