懒笔记
2018年12月英语四级真题第1套 Part III Section C (1) Deep Water Aquifers Found Under California Tripling Previous Reserves
CET-4 · 来自 2018年12月英语四级真题第1套 · Part III Section C (1) · 阅读理解（四选一）

Deep Water Aquifers Found Under California Tripling Previous Reserves

《在加利福尼亚发现地下深层蓄水层,蓄水量是之前的三倍》 —— 2018年12月英语四级真题第1套文章逐层精读

本文选自2016年7月14日发表在 www.interestingengineering.com(《趣味工程学》官网)上的一篇标题为“Deep Water Aquifers Found Under California Tripling Previous Reserves”(《在加利福尼亚发现地下深层蓄水层,蓄水量是之前的三倍》)的文章。

本页是 2018年12月英语四级真题第1套 Part III Section C (1) 文章的精读视角页——这篇说明文全文 326 词、4 段，CEFR 难度 B2（B2 级在英语四级文章中占 46%），作者立场为「客观中立」；英文原文之外，本篇已有的 11 项精读维度逐项展开，其中能迁移到其他英语四级真题文章的判断方法（篇章结构、修辞、言外之意、作者态度、体裁速判）随各维度一并讲透。

精读最佳实践

本页解析里的段号（P1）都可以点——点一下，原文在顶部翻开并定位到该段，解析引用的原文同步标亮；合上原文，你还停在刚才读到的位置。点 P1 试试。

PASSAGE · 文章原文

4 段英文原文

以下为2018年12月英语四级真题第1套 Part III Section C (1) 的阅读理解（四选一）原文，共 4 段。左侧 P1–P4 是段落编号——本页全部解析（结构、逐段、修辞、自检题）都以它为坐标回指原文，点击解析里的段号，原文即在顶部翻开并定位到该段、引用的原文同步标亮；合上原文仍停在当前阅读位置。原文保持卷面形态，不带翻译与标注。

Deep Water Aquifers Found Under California Tripling Previous Reserves

California has been facing a drought for many years now, with certain areas even having to pump freshwater hundreds of miles to their distribution system. The problem is growing as the population of the state continues to expand. New research has found deep water reserves under the state which could help solve their drought crisis. Previous drilling of wells could only reach depths of 1,000 feet, but due to new pumping practices, water deeper than this can now be extracted(抽取). The team at Stanford investigated the aquifers(地下蓄水层) below this depth and found that reserves may be triple what was previously thought.

It is profitable to drill to depths more than 1,000 feet for oil and gas extraction, but only recently in California has it become profitable to pump water from this depth. The aquifers range from 1,000 to 3,000 feet below the ground, which means that pumping will be expensive and there are other concerns. The biggest concern of pumping out water from this deep is the gradual settling down of the land surface. As the water is pumped out, the vacant space left is compacted by the weight of the earth above.

Even though pumping from these depths is expensive, it is still cheaper than desalinating(脱盐) the ocean water in the largely coastal state. Some desalination plants exist where feasible, but they are costly to run and can need constant repairs. Wells are much more reliable sources of freshwater, and California is hoping that these deep wells may be the answer to their severe water shortage.

One problem with these sources is that the deep water also has a higher level of salt than shallower aquifers. This means that some wells may even need to undergo desalination after extraction, thus increasing the cost. Research from the exhaustive study of groundwater from over 950 drilling logs has just been published. New estimates of the water reserves now go up to 2,700 billion cubic meters of freshwater.

PARAGRAPHS · 逐段精读

4 段逐段主旨与解读

逐段拆解2018年12月英语四级真题第1套 的这篇原文——每段给出英文段落主旨、段落标题与中文解读，并提炼一条「这段为什么这样读」的具体方法。

  1. P1

    New Hope for California: Deep Water Discovery

    California's severe drought crisis has found potential relief through newly discovered deep water reserves (below 1,000 feet) made accessible by advanced pumping technology, with reserves possibly triple previous estimates.

    这个 opening paragraph 为整篇文章奠定了 foundation，它不仅 introduces 了 central topic（drought crisis 和 deep water reserves），还通过 triple reserves 这个 impressive figure 制造了 reader interest。从 article thesis 的角度看，这段提供了 why this matters 的 context（severe drought、growing population）和 what's new 的 hook（deep reserves discovery）。它是后续 paragraphs 展开 extraction challenges、cost analysis 的 necessary setup，让读者理解为什么 despite difficulties，这个 solution 仍然 worth exploring。

    识别问题陈述、定位转折短语、提取量化证据
  2. P2

    The Hidden Costs: Economic Viability vs. Environmental Risks

    While deep water extraction has become economically viable recently, pumping from 1,000-3,000 feet depth is expensive and raises serious concerns, particularly land subsidence caused by underground space compaction.

    这个 paragraph 在 article thesis 中扮演 reality check 的角色。当首段建立了 hopeful tone，这段通过 expensive 和 land subsidence 引入了 practical constraints，体现了说明文的 balanced reporting。它 supports thesis 中的 poses challenges 部分，具体化了 what those challenges are。这种 complication 不是要 negate 首段的 solution，而是 contextualize 它，让读者理解这不是 perfect answer 而是 viable option with tradeoffs。为后续段落比较 desalination costs 做好了 analytical groundwork。

    识别限定词、对比结构和强调标记
  3. P3

    A Better Alternative: Why Deep Wells Win

    Despite high extraction costs, deep wells remain more economical than ocean desalination and offer greater reliability, making them California's most promising solution to severe water shortage.

    这个 paragraph 是 article thesis 中 more cost-effective than ocean desalination 的 elaboration 和 justification。它通过 detailed comparison 把抽象的 cost-effectiveness claim 变成 concrete argument，用 reliability 补充了 economic dimension，让 thesis 更 compelling。在文章 structure 中，这段从第二段的 concerns 转向 why it's still worthwhile，是 argumentative pivot。它不是 ignore challenges 而是 contextualize them through comparison，体现了说明文既要 present facts 又要 help readers evaluate options 的 dual purpose。为最后一段引入 additional complication（salinity）做好了 argumentative foundation。

    识别让步结构、比较标记和选项否定描述
  4. P4

    Final Assessment: Complications and Confirmed Potential

    Deep water's higher salinity may require additional desalination and increased costs, yet exhaustive research confirms substantial reserves of up to 2,700 billion cubic meters, validating the solution's potential.

    这个 closing paragraph 完成了 article thesis 的 full picture。它通过 salinity issue 补充了 thesis 中 high salinity 这个 challenge，然后用 research validation 和 concrete numbers 支撑了 newly discovered reserves 的 credibility。在文章 structure 中，这段不是简单 repeat 首段，而是 after examining costs、comparisons、complications，最终 confirm 那 despite all challenges，solution 仍然 viable and substantial。2,700 billion cubic meters 这个 figure 给了 opening paragraph 的 triple reserves 一个 concrete anchor，让抽象的 promise 变成 measurable reality。整段保持了说明文的 balanced tone，既不 oversell 也不 dismiss the solution，而是 present complete picture for informed evaluation。

    平衡限定条件与验证证据
SELF CHECK · 段落自检题

4 道逐段细节自检题

针对2018年12月英语四级真题第1套这篇原文，每段配 1 道细节题（ 1 个正确项 + 5 个干扰项 ，由懒笔记精读引擎基于本段命制，非试卷原题）。 选项默认中性；点「显示答案与解析」展开正确项、解析与最快解法，现代浏览器会同步高亮正确选项。

  1. 第 1 段 定位词 Stanford 1,000 feet

    What did the Stanford team find about the aquifers below 1,000 feet?

    • A They contain no salt and therefore require no further treatment.
    • B They can be reached only after freshwater is pumped hundreds of miles.
    • C The reserves may be three times what was previously thought.
    • D They have already eliminated California's drought crisis.
    • E They are all located less than 1,000 feet below the ground.
    • F Their amount is exactly the same as previously believed.
    显示答案与解析 收起答案与解析

    正确答案：C

    该项完整保留了原文的三层信息：reserves 是研究对象，may 对应不完全确定的科学估计，three times what was previously thought 准确对应 triple what was previously thought。它不是依靠孤立原词作答，而是保留了数量关系、比较基准与语气强度。障碍在于考生必须识别倍数关系，并避免把 may 误读为已经得到最终确认的确定结论。

    结论后截取 时间极紧时，直接在 第1段 做“结论动词截取”：用 Stanford 或 find 落点后，只读取 find 后的一个信息单元，不必从段首逐句翻译。随后把六个选项压缩为“数量关系标签”，优先选择与正确项一致、且保留不确定程度的选项；这比逐项完整翻译更快。

  2. 第 2 段 定位词 biggest concern land surface

    What is the biggest concern about pumping water from the deep aquifers?

    • A Oil and gas extraction will become impossible at greater depths.
    • B The water will be distributed hundreds of miles away at no cost.
    • C The land above the aquifers will become more fertile.
    • D The land surface may gradually sink as emptied spaces are compacted.
    • E New pumping practices cannot extract water below 1,000 feet.
    • F Deep aquifers will be permanently replenished by the weight of the earth.
    显示答案与解析 收起答案与解析

    正确答案：D

    该项准确概括了原文的结果与原因链：water is pumped out 造成 vacant space，earth above 的 weight 使空间 compacted，最终出现 gradual settling down of the land surface。may 和 gradually 忠实保留了过程性与非绝对化表达。障碍在于原文使用 settling down，选项换为 gradually sink；同时将被动机制压缩为 as emptied spaces are compacted，要求考生理解而非只做字面匹配。

    最高级跳读 在 第2段 不必先读 profitability 的铺垫，直接用题干中的最高级 biggest 进行“信号词跳读”，落到 concern 后立刻抓取结果名词与其后的 as 因果链。然后把选项按“物理后果、经济评价、技术能力、其他资源、无关结果”贴标签，选择与正确项相符的完整后果链。

  3. 第 3 段 定位词 deep wells water shortage

    Why are deep wells viewed as a possible answer to California's water shortage?

    • A They remove all repair costs from desalination plants.
    • B They are less expensive because they require desalination before pumping.
    • C They guarantee a permanent end to every drought in the state.
    • D They are located in areas where desalination plants do not exist.
    • E They provide freshwater more cheaply and reliably than ocean-water desalination.
    • F They cost nothing to operate once they have been drilled.
    显示答案与解析 收起答案与解析

    正确答案：E

    该项整合了两项明确比较：deep pumping 虽 expensive，但仍 cheaper than desalinating ocean water；wells are much more reliable，而 desalination plants costly to run 且可能 need constant repairs。选项中的 more cheaply and reliably 分别对应成本和稳定性，并明确保留比较对象 ocean-water desalination。障碍在于答案不是原句复现，而是跨相邻句整合两个比较维度。

    多维对手表 快速处理时，在 第3段 先用 deep wells 直达评价句，再采用“对手法”：不完整翻译段落，只把 wells 和 alternative 两侧的评价信息分别归类。能够完整保留原文比较对象、比较方向和全部关键维度的正确项，就是答案项；只谈单一现象或擅自加入绝对结论的选项可快速排除。

  4. 第 4 段 定位词 salt after extraction

    What consequence may result from the higher salt level in deep water?

    • A All deep wells will produce water that is ready to drink immediately.
    • B Extraction costs will fall because salt makes pumping easier.
    • C The land surface will rise after the water is removed.
    • D The 950 drilling logs will no longer be needed for research.
    • E Ocean water can be used without any desalination process.
    • F Some wells may need desalination after extraction, adding to the cost.
    显示答案与解析 收起答案与解析

    正确答案：F

    该项对应完整的原文因果链：deep water has a higher level of salt，因此 some wells may undergo desalination after extraction，thus increasing the cost。some 和 may 准确保留范围与可能性，after extraction 保留处理顺序，adding to the cost 对应 thus increasing the cost。障碍在于 undergo desalination 被改写为 need desalination，thus 被改写为 adding to，属于四级高频同义改写。

    因果箭头追踪 在 第4段 采用“箭头追踪法”：看到 salt 这一原因指标后，不翻译后面的研究数据句，直接沿结果连接结构读取后果。再从选项中筛选同时含有“处理动作、发生顺序、成本方向”三枚标签的正确项；缺少关键标签或改变因果方向的选项通常不完整或错位。

STRUCTURE · 篇章结构

4 个意群的说明文骨架

按说明文 的行文骨架切分意群，每个意群标注它覆盖的段落与对主旨的作用——逐段读完后回到这里俯瞰全篇，能看清作者为什么按这个顺序行文。

  1. P1

    加州drought问题与deep water reserves发现

    这个opening意群introduce了California长期面临的drought crisis，然后present了一个potential solution：科学家discovered了deep underground water reserves。通过contrast新旧drilling depths，文章reveal出这些aquifers可能contain的water量是previously estimated的三倍，从而establish了problem-solution framework。

    作为说明文的introduction部分，这个意群establish了core topic并提出了central thesis。它先describe existing problem，然后introduce the discovery作为possible solution，为后续paragraphs分析feasibility和challenges做好铺垫。这种problem-solution pattern是expository writing中常见的organizational structure。

    提出新发现的深层水源
  2. P2

    深层抽水的economic feasibility和environmental concerns

    这个意群shift focus到implementation challenges。它首先explain为什么deep drilling现在become economically viable，然后identify major concern：land subsidence caused by water extraction。通过compare oil/gas drilling和water pumping的profitability，文章illustrate了economic factors如何drive这个technological shift，同时introduce了environmental risk这个critical consideration。

    作为说明文的complication部分，这个意群provide了balanced analysis by presenting both positive和negative aspects。它demonstrate了solution并非without challenges，通过discuss cost-benefit和environmental impact，文章maintain了objectivity这一expository writing的key characteristic，让readers能够form informed understanding。

    分析抽水成本与地面下沉问题
  3. P3

    深层水源与desalination的cost comparison

    这个意群introduce comparative analysis，contrast deep well pumping和ocean desalination两种approaches。通过highlight desalination plants的high operational costs和maintenance issues，文章argue that deep wells represent more economically viable option。这个comparison serve to strengthen the argument for deep water extraction，即使前一段mention了challenges。

    这个意群在说明文structure中function as supporting evidence。它通过establish comparative framework来reinforce main thesis。By demonstrating that deep wells are more cost-effective than the alternative，文章strengthen了其central argument，即deep reserves可能是viable solution。这种comparative analysis是expository writing中build persuasive case的effective technique。

    对比深井与海水淡化成本
  4. P4

    深层水源的salinity challenge和水储量新估算

    这个closing意群introduce additional complication（high salt levels in deep water）并provide updated quantitative data。它acknowledge that某些wells可能still require desalination，这add nuance to previous argument。然后文章conclude by presenting research findings和revised estimates，给readers留下specific numerical impression of the resource's magnitude（2,700 billion cubic meters）。

    作为说明文的conclusion部分，这个意群serve dual purpose：它qualify earlier claims by acknowledging salinity issue，maintain了expository objectivity；同时它provide concrete data来substantiate the discovery's significance。这种combination of qualification和quantification是effective expository endings的characteristic，既honest about limitations又emphasize positive potential。

    补充盐度问题与储量数据
MAIN IDEA · 速判主旨

5 步定位这篇文章的主旨

不读完全篇也能锁定主旨——以下 5 步按2018年12月英语四级真题第1套 这篇原文的实际行文顺序给出，每步说明看哪里、看出什么，可直接迁移到其他英语四级文章。

  1. 首段问题转折定位法 P1

    说明文的 first paragraph 往往遵循 problem-solution structure，先 present the existing challenge，再 introduce the new development。这个 pattern 能快速帮你 identify 文章要 address 什么 issue 以及提出了什么 solution，这两者构成 main idea 的 backbone。

  2. 主体段功能标注法 P2 P3 P4

    说明文在 present a solution 之后，通常会用 several paragraphs 来 examine its practical aspects。这些 body paragraphs 的 topic sentences 如果反复出现 cost、expensive、concern、problem 这类词，说明作者在 conduct a realistic assessment。这种 assessment 是 main idea 的重要 component，因为它 refines 我们对 solution 的理解：不只是 'there is a solution'，而是 'a solution with certain trade-offs'。

  3. 比较结构态度捕捉法 P2 P3

    说明文在 present a solution with challenges 时，会用 comparative language 来 establish relative merit。'Still cheaper than'、'more reliable' 这类表达传递一个 crucial message：虽然不完美，但比 alternatives 更好。这种 qualified endorsement 是 main idea 的 attitude component。如果你 miss 这些 comparisons，你可能会 misinterpret 文章为纯粹 negative，但实际上作者是 cautiously optimistic。

  4. 末段数据强化识别法 P4

    说明文的 later paragraphs 如果 provide quantitative evidence 或 research findings，这通常是 strengthening the case for the solution。这些 concrete details 不是 trivial facts，而是 supporting the overall claim that the solution has real potential。如果你 notice 文章用 substantial data 来 conclude，说明 main idea 应该 include 这个 'promising potential' 的维度。

  5. 多维信息综合归纳法 P1 P2 P3 P4

    说明文的 main idea 不是 isolated fact，而是 multiple dimensions 的 synthesis。你需要 combine the problem context、the solution、its limitations、its comparative advantages、和 its potential impact。这个 multi-faceted understanding 才是 accurate main idea。如果你只 pick up one aspect（比如只看到 'expensive' 或只看到 'new discovery'），你会 miss the balanced and complete picture 作者想要 convey。

主旨信号词 drought crisis P1 New research has found P1 could help solve P1 expensive P2 still cheaper than P3 may be the answer P3 triple what was previously thought P1

MAIN IDEA · 主旨

这篇文章在说什么

加州的干旱危机可能通过新发现的深层水资源(地下1,000-3,000英尺)得到缓解。虽然开采这些水源成本高昂且存在地面沉降和高盐度等挑战,但仍比海水淡化更经济实惠,为该州严重的水资源短缺提供了潜在的解决方案。
California's drought crisis may be alleviated by newly discovered deep water reserves (1,000-3,000 feet underground). While extracting this water is expensive and poses challenges like land subsidence and high salinity, it remains more cost-effective than ocean desalination, offering potential relief for the state's severe water shortage.
WORD INFERENCE · 生词推断

4 个生词的上下文推断

不查词典，只用文中线索推出词义——每个词给出推断出的释义与 完整推理链。已收录进英语四级高频真题词集的单词可点击进入词条页。

  • drill 钻探、钻孔

    让我们把这些 clues 串起来：drill 首先出现在 wells 的语境中，是让 water 能从 depths 被 extracted 的关键动作；随后在 oil and gas extraction 的场景中，drill 同样是达到 depths 的手段；最后，drilling logs 证明这是一个有记录的、系统化的工业流程。这三条线索共同指向一个含义：drill 是向地下钻孔、钻探的动作，目的是获取深层资源（water, oil, gas）。

    动作词的对象-目的-专业化三维分析
  • compact 压实、压紧

    我们来梳理这个 physical process：water 被 pump out 后，地下出现 vacant space；earth 的 weight 施加在这个 space 上，导致它被 compacted；compacted 的结果是 land surface 的 settling down（下沉）。整个 chain 中，compact 是中间环节，它是 weight 对 vacant space 的作用效果，也是 land settling 的直接原因。只有"压实、压紧"这个含义能完美衔接这个 cause-effect sequence。

    物理过程的因果链双向定位法
  • feasible 可行的、可实施的

    让我们把两条 threads 编织在一起：第一条 thread 是 contrast structure，feasible 和后续的 costly/repairs 形成对比，说明 feasible 本身是个 positive condition，但不能消除所有 problems；第二条 thread 是 distribution pattern，plants 只在 where feasible 的地方 exist，说明 feasible 是个 threshold，只有满足某些 conditions 才能达到。综合来看，feasible 指的是"在各方面条件允许下可行的、可实施的"。

    评价性词汇的对立与限制双维分析
  • exhaust 详尽的、彻底的

    我们从两个 angles 来确认：从 contextual angle，exhaustive study 涉及 over 950 logs，这个 massive scale 表明研究没有 leave out 任何重要 data，是 thorough 和 comprehensive 的；从 morphological angle，ex- 和 -haust 的组合暗示"把...抽空、用尽"，用在 study 上就是"把所有资料都用上、不留死角"。两个 angles 共同指向 exhaustive 的核心含义：详尽的、彻底的、无遗漏的。

    派生词的语境强度与构词拆解双轨法
RHETORIC · 修辞手法

5 处修辞手法与仿写

每处修辞给出它在本文的具体用法、同类信号词清单与一份可直接套用的 写作仿写建议——读完能认，也能写。

  • 列数字

    P1 P2 P4

    文章中大量使用了 specific numerical data 来支撑论点，比如 depths of 1,000 feet、range from 1,000 to 3,000 feet、triple what was previously thought、over 950 drilling logs、2,700 billion cubic meters of freshwater。这些 precise figures 让读者对 California's water crisis 和 potential solution 有了 quantifiable understanding。通过 concrete numbers，作者成功地将 abstract water shortage problem 转化为 measurable reality，增强了文章的 credibility 和 persuasiveness，让读者清楚认识到 deep water reserves 的 actual scale 和 extraction depth requirements。

    仿写： 写作时要思考：你想说明的 phenomenon 或 solution 有哪些可以 quantified 的方面？比如描述 environmental issue 时，与其说 'pollution is serious'，不如说 'PM2.5 levels reached 150 micrograms per cubic meter, three times the safe standard'。仿写模版：When discussing [topic], provide specific measurements: '[Subject] reaches/spans/contains [precise number + unit], which is [comparison with standard/previous data]'。记住要让 numbers 服务于 main argument，不要 pile up figures without purpose。

  • 作比较

    P2 P3

    文章通过 systematic comparisons 来凸显 deep water extraction 的 relative advantages。主要的 comparison 是 pumping deep water versus desalinating ocean water，作者明确指出 'it is still cheaper than desalinating the ocean water'。这个 cost comparison 直接支持了文章的 central argument，说明 deep aquifers 是 more viable solution。另一个 implicit comparison 是 previous drilling (only 1,000 feet) 和 new pumping practices (beyond 1,000 feet)，突出了 technological advancement。通过这些 side-by-side evaluations，读者能更清楚地理解 why deep water extraction 值得 pursue，尽管它 faces challenges。

    信号词 cheaper than more than rather than compared to versus while whereas in contrast to unlike but however on the other hand instead of

    仿写： 运用比较时要问自己：what is the baseline or alternative 你想让读者 consider？选择 meaningful points of comparison 来突出你的 main point。比如讨论 new technology 时，contrast it with existing methods，说明 'Method A costs $X and takes Y hours, while Method B costs half and completes in 30% less time'。仿写模版：'While [Option A] involves [characteristic/cost/limitation], [Option B] offers [contrasting advantage], making it [comparative conclusion]'。记住 comparison 必须 serve your argument，不是为了 compare 而 compare。

  • 举例子

    P2 P3

    文章通过 concrete examples 来说明 abstract problems 和 solutions。最明显的 example 是 'Some desalination plants exist where feasible, but they are costly to run and can need constant repairs'，这个 real-world instance 让 desalination's drawbacks 变得 tangible。另一个 example 是关于 land subsidence issue，作者用 'the vacant space left is compacted by the weight of the earth above' 来 illustrate the mechanism behind settling。这些 specific instances 帮助读者 visualize the challenges，而不只是 understand them theoretically，使 technical content 更 accessible 给 general readers。

    信号词 for example for instance such as like take... as an example to illustrate including namely specifically in particular consider look at

    仿写： 选择 examples 时要确保它们 representative and relevant to your point。问自己：这个 instance 能否 clearly demonstrate 我要说明的 general truth？比如讨论 renewable energy benefits 时，可以说 'Take Denmark as an example: wind power now supplies 40% of its electricity, reducing carbon emissions by millions of tons annually'。仿写模版：'For instance/Take [specific case], where [concrete detail], demonstrating that [general principle]'。记住 examples 应该 illuminate rather than obscure your main argument。

  • 作诠释

    P2 P3 P4

    文章多处使用 explanatory elaboration 来帮助读者 understand complex concepts。比如解释 land subsidence mechanism 时说 'As the water is pumped out, the vacant space left is compacted by the weight of the earth above'，这个 clarification 让 settling down process 变得 comprehensible。另一处是解释 why deep drilling became profitable：'It is profitable to drill to depths more than 1,000 feet for oil and gas extraction, but only recently in California has it become profitable to pump water'，这个 contextualization 说明了 economic factors behind technological adoption。这些 interpretive statements 填补了 knowledge gaps，让 technical content 对 non-expert readers 更 accessible。

    信号词 which means that is in other words meaning that this indicates implying suggesting essentially basically put simply to put it another way what this means is

    仿写： 写作时识别哪些 concepts 可能 confuse readers，然后 provide clarifying explanations。问自己：如果读者不熟悉这个 field，什么需要 further explanation？比如介绍 blockchain 时，可以说 'The data is stored in blocks that are chained together, meaning each new record links to previous ones, creating an unchangeable history'。仿写模版：'[Term/Concept], which means [plain-language explanation], [further clarification of mechanism/implication]'。关键是 anticipate reader's confusion 并 proactively address it。

  • 分类别

    P1 P2 P3

    文章中有 implicit categorization 当讨论 water sources 时。作者区分了 shallow aquifers (up to 1,000 feet)、deep aquifers (1,000-3,000 feet)、以及 ocean water 这三类 water sources。每一类都有 distinct characteristics：shallow aquifers 是 traditional source，deep aquifers 是 newly accessible reserves with challenges，ocean water 需要 expensive desalination。这个 categorization framework 帮助读者 systematically understand different options for addressing water shortage，以及为什么 deep aquifers 是 promising yet challenging solution。通过这种 categorical organization，复杂的 water supply landscape 变得 structured and manageable。

    信号词 types of kinds of categories can be divided into classified as fall into range from including consists of comprise there are several

    仿写： 建立分类时要确定 clear classification criterion。问自己：what is the basis for dividing this topic？比如讨论 renewable energy 时，可以按 source type 分类：'Renewable energy sources fall into several categories: solar (harnessing sunlight), wind (capturing air movement), hydro (using water flow), and geothermal (tapping earth's heat)'。仿写模版：'[Subject] can be divided into [number] types/categories: [Category A] featuring [characteristic], [Category B] characterized by [characteristic], and [Category C] with [characteristic]'。确保 categories 之间有 clear boundaries 且 collectively cover the domain。

IMPLIED MEANING · 言外之意

6 处话里有话

作者没有明说、但靠信号词传递出来的态度与暗示——每处给出原文片段、信号词类型与解读。

  • 新技术突破带来的开采可能性

    P1
    Previous drilling of wells could only reach depths of 1,000 feet, but due to new pumping practices, water deeper than this can now be extracted.

    转折类 but however yet nevertheless nonetheless on the contrary in contrast

    这个 but 的言外之意是 technological progress has opened up new possibilities，以前的 1,000 feet depth limit 不再是 insurmountable barrier。对文章主旨的 role 是 establish hope：虽然 California 面临 severe drought，但 new extraction methods 让 previously inaccessible water reserves 变得 feasible，这为 solving the crisis 提供了 foundational premise。

  • 经济可行性的转变

    P2
    It is profitable to drill to depths more than 1,000 feet for oil and gas extraction, but only recently in California has it become profitable to pump water from this depth.

    时间限定类 only recently just now lately not until only in recent years for the first time newly

    Only recently 的言外之意是 the drought has become so severe that previously uneconomical solutions 现在 make economic sense。它 reveals California's water crisis 已经 reached a critical point，迫使人们 resort to expensive measures。对主旨的 value 是 underscore the severity：当 costly deep-water extraction 都变得 profitable 时，说明 traditional water sources 已经 severely depleted，这 justifies 文章提出的 unconventional solution。

  • 深层开采的环境代价

    P2
    pumping will be expensive and there are other concerns. The biggest concern of pumping out water from this deep is the gradual settling down of the land surface.

    委婉表达 concerns issues challenges considerations drawbacks limitations complications

    Concerns 的言外之意是 deep-water extraction 并非 perfect solution，it involves environmental risks like land subsidence。但用 concerns 而不是 disasters 或 dangers，暗示作者认为这些 risks 是 acceptable or manageable given the severity of drought。对主旨的 contribution 是 provide realistic assessment：文章不是 overselling the solution，而是 acknowledging its costs，这 makes the argument more credible when concluding it's still better than alternatives。

  • 经济比较中的相对优势

    P3
    Even though pumping from these depths is expensive, it is still cheaper than desalinating the ocean water in the largely coastal state.

    让步类 Even though even though although despite in spite of while whereas

    Even though 的言外之意是 deep-water pumping 的 high cost 是 lesser evil compared to desalination。它 implies California is choosing between expensive options，没有 cheap solution available。对主旨的 significance 是 justify the proposed approach：through comparative economics，文章 demonstrates 虽然 deep wells expensive，但 they represent the most practical pathway，这 reinforces 主旨中的 cost-effective 判断。

  • 海水淡化的实际局限

    P3
    Some desalination plants exist where feasible, but they are costly to run and can need constant repairs.

    模糊限制语 where feasible when possible to some extent in certain cases under some circumstances where applicable as appropriate

    Where feasible 的言外之意是 desalination plants 只能在 limited locations 建立，不是 scalable solution for California's statewide crisis。配合 some, costly, constant repairs，暗示 desalination 既 geographically limited 又 operationally problematic。对主旨的 role 是 eliminate competing alternatives：by showing desalination's limitations，文章 strengthens the case for deep-water extraction as more reliable and widespread solution。

  • 深层水源的附加复杂性

    P4
    One problem with these sources is that the deep water also has a higher level of salt than shallower aquifers. This means that some wells may even need to undergo desalination after extraction, thus increasing the cost.

    递进类 also additionally furthermore moreover besides in addition what's more

    Also 的言外之意是 deep-water extraction 面临 compounding challenges：不仅 expensive and risky（land subsidence），水质还 requires additional treatment。Even need desalination 这个 irony 暗示 solution 不如最初看起来 straightforward。对主旨的 impact 是 add nuance to cost-effectiveness claim：虽然文章 concludes deep wells are better option，但 honestly present 它们的 complexity，making the assessment more credible 而不是 one-sided promotion。

AUTHOR ATTITUDE · 作者态度

作者态度：客观中立

结论先行：本文作者态度为客观中立（ cautiously optimistic and objective）。下面是按步骤还原的判断过程与文中的态度信号词。

  1. 首段情态词定调 P1

    说明文开篇常用科学发现引出话题，如果作者用could/may这类modal verb来描述研究的作用，说明作者在保持谨慎，而不是一上来就strongly支持或反对，这是判断attitude的第一个入口。

  2. 忧虑词定位法 P2

    说明文中如果作者在讲完好处后立刻引入concern或problem，说明作者在做balanced reporting，试图呈现多方面视角，而不是单纯唱好这个技术。

  3. 让步重心捕捉法 P3

    这种concession structure在说明文里常用来暗示作者的微妙倾向，即使承认成本高，作者依然强调这是当前更优的方案，说明态度略偏positive但不夸张。

  4. 结尾数据定调法 P4

    说明文常常以data或research结果来收束全文，如果结尾没有明显的褒贬词汇，说明作者把判断权交给了读者，倾向于保持整体objective。

  5. 四步汇总法 P1 P2 P3 P4

    这四类信号分别代表谨慎、balanced reporting、轻微positive倾向和objective收尾，符合说明文以报道事实为主、不做强烈褒贬的文体特征，因此最终态度定为客观中立、略带cautiously optimistic。

文中的态度信号词

  • could help solve P1

    这个modal短语说明作者在描述new research潜力时用了谨慎语气，既表达了希望又没有做出绝对保证，是典型的cautiously optimistic表达。

    同类词 may be triple could now be extracted previously thought

  • the biggest concern P2

    这个词组明确标出作者认为的drawback，即land surface的settling down，说明作者没有一味唱好这项技术，而是如实呈现风险，属于balanced reporting。

    同类词 concern problem expensive settling down

  • even though...still cheaper P3

    这个让步转折结构先承认pumping成本高，紧接着用still cheaper来强调它相对desalination的优势，暗示作者对deep well方案略带支持。

    同类词 even though...still much more reliable hoping...may be the answer

  • increasing the cost P4

    这里再次提出deep water的负面属性——盐度高、需要额外脱盐、成本进一步上升，说明作者在收尾前依然坚持呈现问题的两面性，而不是只强调好处。

    同类词 higher level of salt undergo desalination

  • New estimates...2,700 billion cubic meters P4

    结尾用纯数据和研究规模来结束全文，没有夹杂任何主观评价词汇，说明作者最终把结论交给数据本身，保持了客观基调。

    同类词 estimates published exhaustive study 950 drilling logs

GENRE · 速判体裁

30 秒判定这是一篇说明文

体裁决定读法与出题套路。以下判断步骤与标志词全部以本文为例，可直接迁移到其他英语四级 真题文章。

如何快速判断这是一篇说明文？

  1. 首句陈述客观背景 P1

    第1段 的 opening 是 'California has been facing a drought'，这是在 state a factual situation，不是 present an argument（议论文特征）也不是 report a recent event with time-sensitive details（新闻特征）。说明文会用 present perfect tense 来 describe ongoing situations，而新闻更倾向于 past tense 的 specific events。

  2. 层层递进的信息架构 P1 P2 P3 P4

    整篇文章的 structure 非常清晰：第1段 introduces the drought problem 和 new solution；第2段 explains technical challenges；第3段 compares costs with alternatives；第4段 addresses remaining issues。这种 logical progression 是 expository writing 的标志，不同于议论文的 argument-counterargument structure 或新闻的 inverted pyramid structure。

  3. 技术细节的解释性呈现 P1 P2 P4

    文章包含大量 technical details：'depths of 1,000 feet'，'aquifers below this depth'，'reserves may be triple'，'2,700 billion cubic meters'。这些 figures 不是在 prove a point，而是在 explain the scale and nature of the water reserves。第2段 详细 explains the pumping mechanism 和 land settling issue，这是典型的 expository explanation。

  4. 中立客观的语言基调 P1 P2 P3 P4

    整篇文章用 neutral descriptive language：'The problem is growing'，'It is profitable to drill'，'Wells are much more reliable'。这些是 factual statements 而非 evaluative judgments。没有出现议论文常见的 'we must'，'it is crucial that' 或新闻常见的 'yesterday'，'breaking' 等 urgency markers。

  5. 知识传递导向的综合特征 P1 P2 P3 P4

    从整体看，文章没有 thesis statement 需要 defend（议论文标志），没有 lead paragraph 突出 newsworthy event（新闻标志），而是系统地 present knowledge about 一个 topic。The progression from problem identification → technical analysis → cost comparison → limitations 是典型的 expository pattern，aim at comprehensive understanding rather than immediate action or opinion formation。

哪些词暴露了说明文体裁？

  • water reserves P1 说明对象定义解释词 aquifers distribution system pumping practices drilling logs desalination plants
  • range from 1,000 to 3,000 feet P2 事物属性功能描述词 range from...to... depths of 1,000 feet deeper than this depth triple what was previously thought expensive
  • due to P1 说明顺序与例证词 as which means that thus this means that even though
  • The problem P1 说明对象定义解释词 The team The aquifers The biggest concern Some desalination plants Wells
  • New research has found P1 说明顺序与例证词 Previous drilling The team at Stanford investigated Research from the exhaustive study New estimates drilling logs has just been published
SENTENCE INSIGHTS · 句子精讲

7 句真题句逐层精讲

下列真题句各有独立的句子解析页——中文翻译、结构树逐层拆解、成分与时态、考点讲解与真题高频词。点击句子进入完整解析。

FAQ · 常见问题

关于 《在加利福尼亚发现地下深层蓄水层,蓄水量是之前的三倍》 的常见问题

2018年12月英语四级真题第1套 Part III Section C (1) 文章 Deep Water Aquifers Found Under California Tripling Previous Reserves 的原文出自哪里？
2018年12月英语四级真题第1套 Part III Section C (1) 文章 Deep Water Aquifers Found Under California Tripling Previous Reserves 选自2016年7月14日发表在 www.interestingengineering.com(《趣味工程学》官网)上的一篇标题为“Deep Water Aquifers Found Under California Tripling Previous Reserves”(《在加利福尼亚发现地下深层蓄水层,蓄水量是之前的三倍》)的文章。
2018年12月英语四级真题第1套文章《在加利福尼亚发现地下深层蓄水层,蓄水量是之前的三倍》的主旨是什么？
加州的干旱危机可能通过新发现的深层水资源(地下1,000-3,000英尺)得到缓解。虽然开采这些水源成本高昂且存在地面沉降和高盐度等挑战,但仍比海水淡化更经济实惠,为该州严重的水资源短缺提供了潜在的解决方案。（英文表述：California's drought crisis may be alleviated by newly discovered deep water reserves (1,000-3,000 feet underground). While extracting this water is expensive and poses challenges like land subsidence and high salinity, it remains more cost-effective than ocean desalination, offering potential relief for the state's severe water shortage.）
Deep Water Aquifers Found Under California Tripling Previous Reserves（2018年12月英语四级真题第1套文章）是什么体裁？难度如何？
体裁为说明文，作者立场是客观中立（cautiously optimistic and objective）。CEFR 难度 B2，全文 326 词、4 段；在英语四级全部 511 篇真题文章中，B2 级共 234 篇（占 46%）。
2018年12月英语四级真题第1套文章《在加利福尼亚发现地下深层蓄水层,蓄水量是之前的三倍》的篇章结构是怎样的？
全文 4 段按说明文骨架分为 4 个意群：第1段——加州drought问题与deep water reserves发现；第2段——深层抽水的economic feasibility和environmental concerns；第3段——深层水源与desalination的cost comparison；第4段——深层水源的salinity challenge和水储量新估算。
Deep Water Aquifers Found Under California Tripling Previous Reserves 一文的作者态度是什么？
作者态度是客观中立（cautiously optimistic and objective）。判断路径：首段情态词定调 → 忧虑词定位法 → 让步重心捕捉法 → 结尾数据定调法 → 四步汇总法；文中的态度信号词包括 could help solve（第1段）、the biggest concern（第2段）、even though...still cheaper（第3段）、increasing the cost（第4段）、New estimates...2,700 billion cubic meters（第4段）。
2018年12月英语四级真题第1套文章 Deep Water Aquifers Found Under California Tripling Previous Reserves 中有哪些值得积累的生词？
按文中出现顺序共 4 个：drill（钻探、钻孔）、compact（压实、压紧）、feasible（可行的、可实施的）、exhaust（详尽的、彻底的），每个词的词义都可以由文中上下文线索推断得出。

本页数据最后更新：