3.18 考研英语阅读模拟试题:思考水安全【难度7.2】

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Section II Reading Comprehension 

Part A 

Directions: Read the following four texts. Answer the questions below each text by choosing A, B, C or D. Mark your answers on the ANSWER SHEET. 

Text 3

I have spent my career studying water, but the longer I work in this field, the more uneasy I become about a simple question: Is our water actually safe? Not safe according to outdated testing codes, but safe in the way that truly matters for the communities that depend on it. Because what I am seeing is that the way we measure water contamination is simply not good enough.

When people think about water safety, they usually think about drinking water. But human exposure goes far beyond what we drink; we swim, boat, and fish in local waterways. Yet the systems we rely on to assess health risks are built on narrow indicators, most commonly fecal indicator bacteria such as E. coli. These organisms serve as proxies, signaling the possible presence of sewage contamination. If counts exceed a regulatory threshold, a water body is deemed unsafe.

But these indicators do not tell the full story. Traditional indicators often fail to identify the source of contamination or the true pathogen load affecting human health. Indicator bacteria may persist in sediments or fluctuate dramatically depending on hydrological conditions. I can test the same site hours apart and get dramatically different readings. Too often, policy decisions rest on these incomplete snapshots, turning compliance into a technical exercise rather than a meaningful measure of public safety.

This gap between conventional monitoring and advanced source tracking is consequential. In recent studies applying microbial source tracking, we have been able to distinguish human-derived contamination from other environmental sources. These approaches allow us to trace contamination to failing septic systems or infrastructure leaks that would have remained obscured under conventional regulatory tests.

Part of the challenge lies in human psychology and aging infrastructure. There is a deep cultural trust in water systems in developed nations; we associate contamination crises with distant geographies. Yet, much of our municipal piping is decades old. Leakage and overflow events introduce contaminants into waterways with alarming regularity. Private septic systems pose an even more localized risk, contributing to diffuse contamination that remains invisible until it is advanced.

There is also an economic reality. Advanced testing, microbial source tracking, and genomic analysis are more expensive than routine indicator monitoring. Municipalities and regulatory agencies often default to lower-cost testing because it satisfies statutory requirements. But compliance is not the same as protection. If a water body meets outdated thresholds yet still exposes the public to pathogens, we have merely met the minimum legal requirement, not safeguarded health.

This is where policy must evolve alongside science. We must expand monitoring frameworks to include contamination source identification and cumulative health risk assessment. Yes, these reforms are costly, but preventive environmental management is almost always more cost-effective than reactive healthcare intervention for waterborne diseases.

If we continue relying on incomplete measures, we will continue underestimating exposure and underprotecting the public. If the only answer we can offer is that water meets a regulatory number, without deeper analysis or source identification, then we are placing trust in a system that has not earned it.

31. The author mentions E. coli in Paragraph 2 primarily to _______.

[A] emphasize the severe health risks associated with drinking water 

[B] illustrate the limitations of current water safety assessment tools 

[C] propose a new biological standard for measuring pathogen loads 

[D] prove that local waterways are heavily contaminated by sewage

32. According to Paragraph 3, traditional indicator bacteria are unreliable because they _______.

[A] are easily destroyed by fluctuating hydrological conditions 

[B] fail to persist in sediments for a sufficient amount of time 

[C] cannot accurately reflect the exact origin and actual amount of pathogens 

[D] are consistently manipulated to meet technical compliance standards

33. What is a major reason why regulatory agencies prefer conventional monitoring over advanced source tracking?

[A] Advanced tracking methods are scientifically unproven and inaccurate. 

[B] Conventional monitoring helps them avoid upgrading aging infrastructures. 

[C] Advanced testing contradicts the cultural trust in developed nations. 

[D] Conventional methods are cheaper and sufficient to fulfill legal obligations.

34. The phrase "compliance is not the same as protection" (Para. 6) suggests that _______.

[A] meeting statutory requirements does not guarantee public health safety 

[B] protective measures should be prioritized over legal compliance 

[C] outdated thresholds are deliberately set to deceive the public 

[D] municipal water systems are exempt from environmental protection laws

35. Which of the following best summarizes the author's main argument?

[A] The global water crisis can only be solved by replacing aging infrastructure.

[B] Public trust in water safety is mostly unjustified due to human psychology. 

[C] Water safety policies must be modernized with advanced science to truly protect health. 

[D] Reactive healthcare interventions are fundamentally more effective than preventive management.

附注：根据历年考研英语真题阅读题源外刊等，摘选最新文章，模拟仿真出题。

参考答案见以下。

Quick look: BCDAC

31. 【答案】B

【解析】题型：修辞目的/例证题

定位： 第二段 "...built on narrow indicators, most commonly fecal indicator bacteria such as E. coli." 以及第三段 "But these indicators do not tell the full story."

分析： 作者在第二段提到大肠杆菌（E. coli）作为一种“狭隘的指标”（narrow indicators）的代表，并在第三段立刻指出这些指标“不能说明全部问题”（do not tell the full story），因为它们无法识别污染源和真实的病原体负荷。因此，提及大肠杆菌是为了说明当前水质安全评估工具的局限性。这对应选项 B。

干扰项：[A] 第二段明确指出，人类的接触“远远超出了我们所喝的水”（goes far beyond what we drink），重点在非饮用水的接触风险。 [C] 大肠杆菌是旧标准，而非作者提出的新标准。 [D] 虽然水体可能被污染，但提及该细菌的目的是批判检测方法，而非证明污染程度。

32. 【答案】C

【解析】题型：细节题

定位： 第三段第二句 "Traditional indicators often fail to identify the source of contamination or the true pathogen load affecting human health."

分析： 原文明确指出，传统指标无法识别污染的来源（source of contamination），也无法确定真正影响人类健康的病原体负荷（true pathogen load）。这与选项 C 的表述“无法准确反映病原体的确切来源和实际数量”完全一致。

干扰项：[A] 原文说它们可能“随着水文条件剧烈波动”（fluctuate dramatically），而不是“容易被破坏”（easily destroyed）。 [B] 原文说它们可能“在沉积物中存活/残留”（persist in sediments），选项表述相反。 [D] 遵守规定变成了一项“技术性工作”，但文中并未说指标被“操纵”（manipulated）。

33. 【答案】D

【解析】题型：因果细节题

定位： 第六段第二、三句 "Advanced testing... are more expensive than routine indicator monitoring. Municipalities and regulatory agencies often default to lower-cost testing because it satisfies statutory requirements."

分析： 监管机构默认使用低成本的常规测试（即传统监测），原因有两个：一是高级测试更贵（经济原因），二是低成本测试足以满足法定要求（satisfies statutory requirements）。这对应选项 D。

干扰项：[A] 文章强烈支持高级追踪方法，并未说其未经科学证实。 [B] 虽然基础设施老化是个问题，但这不是监管机构选择常规监测的直接原因。 [C] 高级测试与文化信任无关，文化信任是导致公众忽视危险的原因。

34. 【答案】A

【解析】题型：句意推断题

定位： 第六段最后两句 "But compliance is not the same as protection. If a water body meets outdated thresholds yet still exposes the public to pathogens, we have merely met the minimum legal requirement, not safeguarded health."

分析： “合规不等于保护”这句话紧接着被解释为：如果水体符合了过时的标准阈值，但仍然让公众暴露在病原体中，那么我们只是满足了“最低法律要求”，并没有真正“保障健康”。这说明满足法定要求并不能保证公共卫生安全。选项 A 完美转述了这一含义。

干扰项：[B] 文章是呼吁改变合规标准以实现保护，而不是在现行法律下将保护凌驾于合规之上。 [C] 阈值是“过时的”（outdated），但文中并未暗示这是“蓄意欺骗”（deliberately set to deceive）。 [D] 市政供水系统并未被豁免法律，它们只是在遵守过时的法律。

35. 【答案】C

【解析】题型：主旨大意题

定位： 全文，尤其是倒数第二段 "This is where policy must evolve alongside science. We must expand monitoring frameworks..."

分析： 文章开篇质疑当前的水质安全标准，中间论述了旧指标的缺陷、新技术的优势以及阻碍新技术的经济和基础设施原因。最后，作者得出结论并呼吁：政策必须与科学同步发展，必须扩大监测框架以真正保护公众健康。选项 C 准确概括了这一核心论点。

干扰项：[A] 基础设施老化只是挑战的一部分，文章的核心在于“检测标准/政策的更新”，而非仅仅更换设施。 [B] 公众心理只是导致问题被忽视的一个侧面因素，不是全文主旨。 [D] 与原文完全相反，倒数第二段说“预防性环境管理几乎总是比反应性医疗干预更具成本效益”。

【词汇注释】

proxy: noun (SUBSTITUTE) something that you use to represent something else that you are trying to measure or calculate 代理指标；替代物（文中指大肠杆菌被用作污水污染的指示物）

pathogen: noun (DISEASE) a thing that causes disease, for example a bacterium or a virus 病原体（文中指真正影响人类健康的致病微生物）

fluctuate: verb (CHANGE) to change frequently in size, amount, quality, etc., especially from one extreme to another 波动；起伏（文中指传统指示菌的数量会随水文条件剧烈变化）

septic system: noun (WASTE) a system for treating solid waste, often consisting of an underground tank 化粪池系统（文中指导致局部水污染的私人污水处理设施）

diffuse: adjective (SPREAD) spread over a wide area 弥漫的；分散的（文中指化粪池泄漏导致的面源污染）

statutory: adjective (LEGAL) fixed by law; that must be done by law 法定的（文中指过时的常规检测足以满足法律规定的最低要求）

【参考译文】

我毕生都在研究水，但在这个领域工作得越久，我就越对一个简单的问题感到不安：我们的水真的安全吗？不是按照过时的检测标准所说的安全，而是对依赖它的社区而言真正意义上的安全。因为我所看到的是，我们衡量水体污染的方式根本不够好。

当人们想到水安全时，通常会想到饮用水。但人类的接触远远超出了我们所喝的水；我们在当地水道中游泳、划船和钓鱼。然而，我们用来评估健康风险的系统是建立在狭隘的指标之上的，最常见的是粪便指示菌，如大肠杆菌。这些微生物充当了代理指标，发出可能存在污水污染的信号。如果计数超过了监管阈值，水体就会被认为是不安全的。

但这些指标并不能说明全部问题。传统指标通常无法识别污染的来源，也无法确定真正影响人类健康的病原体负荷。指示菌可能会残留在沉积物中，或者根据水文条件产生剧烈波动。我可以在相隔几小时的时间里测试同一个地点，却得到截然不同的读数。政策决定往往基于这些不完整的快照，使得“合规”变成了一项技术性工作，而不是衡量公共安全的有意义的标准。

传统监测与高级污染源追踪之间的这种差距是具有重大影响的。在应用微生物污染源追踪的最新研究中，我们已经能够将人类衍生的污染与其他环境来源区分开来。这些方法使我们能够将污染追溯到发生故障的化粪池系统或基础设施泄漏，而这些在传统的监管测试下是会被掩盖的。

部分挑战在于人类的心理和老化的基础设施。在发达国家，人们对供水系统有着深厚的文化信任；我们习惯将污染危机与遥远的地方联系起来。然而，我们许多市政管道都有几十年的历史了。泄漏和溢流事件以令人担忧的频率将污染物引入水道。私人化粪池系统构成了更为局部的风险，导致了分散的污染，而这些污染在恶化之前往往是不可见的。

此外还有经济现实。高级测试、微生物源追踪和基因组分析比常规的指标监测更昂贵。市政当局和监管机构通常默认使用低成本的测试，因为它满足了法定要求。但合规并不等于保护。如果一个水体达到了过时的阈值，但仍然让公众暴露在病原体中，我们仅仅是满足了最低法律要求，而没有保障健康。

这就是政策必须与科学同步发展的地方。我们必须扩大监测框架，纳入污染源识别和累积健康风险评估。是的，这些改革代价高昂，但预防性环境管理几乎总是比治疗水传播疾病的反应性医疗干预更具成本效益。

如果我们继续依赖不完整的措施，我们将继续低估暴露风险，无法充分保护公众。如果我们能给出的唯一答案是水质符合某个监管数字，而没有更深入的分析或污染源识别，那么我们就是在把信任寄托在一个配不上它的系统上。

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