懒笔记
2015年6月英语四级真题第1套 Part III Section C (1)
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2015年6月英语四级真题第1套 Part III Section C (1)

说明文 · 阅读理解（四选一） · 真题文章逐层精读

本页是 2015年6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 349 词、6 段，CEFR 难度 C1（C1 级在英语四级文章中占 32%），作者立场为「消极批判」；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

6 段英文原文

以下为2015年6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 6 段。左侧 P1–P6 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。

Some of the world's most significant problems never hit headlines. One example comes from agriculture. Food riots and hunger make news. But the trend lying behind these matters is rarely talked about. This is the decline in the growth in yields of some of the world's major crops. A new study by the University of Minnesota and McGill University in Montreal looks at where, and how far, this decline is occurring.

The authors take a vast number of data points for the four most important crops: rice, wheat, corn and soybeans(大豆). They find that in between 24% and 39% of all harvested areas, the improvement in yields that took place before the 1980s slowed down in the 1990s and 2000s.

There are two worrying features of the slowdown. One is that it has been particularly sharp in the world's most populous(人口多的) countries, India and China. Their ability to feed themselves has been an important source of relative stability both within the countries and on world food markets. That self-sufficiency cannot be taken for granted if yields continue to slow down or reverse.

Second, yield growth has been lower in wheat and rice than in corn and soybeans. This is problematic because wheat and rice are more important as foods, accounting for around half of all calories consumed. Corn and soybeans are more important as feed grains. The authors note that "we have preferentially focused our crop improvement efforts on feeding animals and cars rather than on crops that feed people and are the basis of food security in much of the world."

The report qualifies the more optimistic findings of another new paper which suggests that the world will not have to dig up a lot more land for farming in order to feed 9 billion people in 2050, as the Food and Agriculture Organisation has argued.

Instead, it says, thanks to slowing population growth, land currently ploughed up for crops might be able to revert(回返) to forest or wilderness. This could happen. The trouble is that the forecast assumes continued improvements in yields, which may not actually happen.

PARAGRAPHS · 逐段精读

6 段逐段主旨与解读

逐段拆解2015年6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

    The Hidden Crisis in Global Agriculture

    Introduces the underreported problem of declining crop yield growth as a critical agricultural crisis, setting up a research-based examination of this trend.

    作为opening paragraph，第1段的primary function是establish文章的problem focus和analytical framework。它为整篇文章的main idea——crop yield slowdown threatens food security——提供了initial framing。通过emphasize问题的underreported nature，这个段落justify了entire article的necessity，回答了why this topic matters的question。同时，research introduction也foreshadow了后续paragraphs会present data-driven evidence来support文章的central argument。

    识别问题-搭建语境-引入分析
  2. P2

    Quantifying the Yield Slowdown

    Presents data-driven evidence showing that yield growth for four major crops slowed significantly in 24-39% of harvested areas during the 1990s and 2000s compared to pre-1980s rates.

    第2段作为first evidence paragraph，它的function是transform 第1段提出的abstract concern into concrete, measurable reality。通过provide specific data，这个段落support文章main idea关于yield slowdown的severity和scope。它establish了问题的empirical foundation，making subsequent analysis of consequences（第3段和第4段）more compelling。这个段落也serve as transition：从problem introduction到detailed examination of implications。

    范围界定-数据提取-含义解读
  3. P3

    Geographic Concentration: The India-China Factor

    Highlights the first major concern that yield slowdown is particularly severe in India and China, threatening their food self-sufficiency and potentially destabilizing both domestic and global food security.

    第3段开始shift文章focus从describing问题到analyzing consequences。它serve文章main idea by demonstrating yield slowdown不是abstract statistical trend，而是concrete threat to具有global significance的两个countries。通过emphasize self-sufficiency和stability，段落connect agricultural data到更广泛的food security concern，directly supporting文章关于这个issue threatens global stability的central argument。这个段落也establish pattern for next paragraph：identifying和explaining specific worrying aspects。

    现象-情境-后果的逻辑链
  4. P4

    Crop Priorities: Food Security versus Feed Production

    Identifies the second major concern that yield growth is slower for wheat and rice—key food crops—than for corn and soybeans, revealing misaligned agricultural priorities that favor feeding animals over people.

    第4段完成文章problem analysis的second phase，parallel with 第3段建立的structure。它deepen文章main idea by revealing yield slowdown不仅是geographic问题（第3段），更是systemic priority问题。通过expose misalignment between agricultural research focus和human food security needs，段落support文章关于this crisis threatens feeding future populations的central concern。这个paragraph也inject normative element into otherwise descriptive analysis，suggesting问题partly stems from misguided priorities而非inevitable constraints。

    事实-框架-评判的论证层次
  5. P5

    Challenging Optimistic Forecasts

    Introduces an alternative optimistic study suggesting less farmland expansion will be needed by 2050, which the current research challenges and qualifies.

    第5段 shift文章from internal analysis（自己的findings和其implications）到external dialogue（与其他research的relationship）。它serve文章main idea by showing yield slowdown concern不是isolated alarmism——there exist competing optimistic narratives about future food security。通过introduce这个alternative view，段落set up for 第6段来explain为什么自己的pessimistic findings matter，即使有optimistic forecasts存在。这个paragraph也broaden文章scope from purely descriptive到evaluative：assessing different predictions about future。

    他论引入-立场标明-批判铺垫
  6. P6

    The Yield Assumption: A Critical Flaw

    Critiques the optimistic forecast by exposing its dependence on continued yield improvements, which the article's data shows may not materialize, thereby questioning the feasibility of avoiding farmland expansion.

    第6段作为concluding paragraph，它consolidate文章的argumentative arc。通过systematically dismantle optimistic alternative，段落reinforce文章main idea about yield slowdown threatening future food security的urgency和validity。它answer implicit question：如果有其他研究说问题不严重，为什么要worry about yield slowdown？段落show那些optimistic views rest on precisely the assumption（continued yield improvement）that article's data challenge。这个circular completion——从identifying yield slowdown问题（第1段-2）到showing为什么不能assume it away（第6段）——give文章intellectual coherence和persuasive closure。

    让步-弱点识别-证据反驳
SELF CHECK · 段落自检题

6 道逐段细节自检题

针对2015年6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 agricultural trend insufficient public attention

    What agricultural trend is identified as receiving insufficient public attention?

    • A The growing frequency of food riots worldwide.
    • B The expansion of farmland into wilderness areas.
    • C The slowing growth of yields for major crops.
    • D The replacement of rice and wheat by corn and soybeans.
    • E The failure of universities to collect crop data.
    • F The rise in global demand for agricultural products.
    显示答案与解析 收起答案与解析

    正确答案：C

    该项同时保留了 decline、growth in yields、major crops 三个核心语义，准确回答了 trend 是什么。它没有把 food riots 或 hunger 当作趋势本身，而是回到这些新闻现象背后的 yield growth 问题。障碍在于原文用 decline in the growth，选项改写为 slowing growth；考生若逐词匹配，容易误以为只有 decline 才正确。

    媒体对照后读 时间极紧时，直接抓题干的 insufficient public attention，而非先读 agricultural。它在 第1段 对应一组醒目的媒体语义链：headlines、make news、rarely talked about。找到该对照后，只读 But 后的一句，并用“正确项是否是可长期追踪的指标变化”作反向筛选；满足这一点的正确项就是答案项。

  2. 第 2 段 定位词 find harvested areas

    What did the researchers find about yield improvement in harvested areas?

    • A Yields fell by 24% to 39% in all harvested areas.
    • B Yield improvement accelerated after the 1980s.
    • C All four crops experienced the same decline in every region.
    • D It slowed in 24% to 39% of harvested areas during the 1990s and 2000s.
    • E The data were collected only in the 1990s and 2000s.
    • F Soybean yields improved more rapidly than rice yields.
    显示答案与解析 收起答案与解析

    正确答案：D

    该项准确保留了比例范围、统计对象、时间和变化方向，并将 the improvement in yields 的后置修饰压缩为 It。最关键的是 slowed 指向 improvement，而非 yields 的绝对值。障碍在于 between 24% and 39% 容易被误读为两个相继发生的比例，in the 1990s and 2000s 也容易被误认为增长发生的时期。

    百分比看宾语 在 第2段 中，不必通读四种 crop 的列表。直接把题干的 harvested areas 当作“数字的单位”扫描，找到百分比后只画出其左右的三个成分：比例、被修饰对象、趋势动词。随后用正确项的数字结构反验：正确项必须让比例修饰 areas，而不是修饰 yields。

  3. 第 3 段 定位词 India and China especially concerning

    Why is the yield slowdown in India and China especially concerning?

    • A They produce more corn and soybeans than any other countries.
    • B Their populations are expected to decline sharply.
    • C They depend entirely on imported food supplies.
    • D Their agricultural land is likely to revert to forest.
    • E Their food self-sufficiency is vital to domestic and global market stability.
    • F The slowdown has already caused worldwide food riots.
    显示答案与解析 收起答案与解析

    正确答案：E

    该项概括了两层稳定性：within the countries 与 on world food markets，并把 ability to feed themselves 同义转换为 food self-sufficiency。它解释了为何 slowdown 有更大后果，而非只重复 slowdown 特别严重。障碍在于 vital 属于概括性强化词，考生需要由 important source of relative stability 推断出其关键意义。

    国名后找后果 在 第3段，先以 India and China 命中句子，然后跳过对 slowdown 的重复描述，直接从 Their 开始读到段末。这样可迅速抓到“能力-稳定-条件风险”的因果链。用正确项检验时，只判断它是否同时覆盖 self-sufficiency 与两层 stability；覆盖者即为答案项。

  4. 第 4 段 定位词 crop improvement efforts concern

    What concern do the authors raise about crop improvement efforts?

    • A Rice and wheat are mainly cultivated as feed grains.
    • B Corn and soybeans provide about half of all calories consumed.
    • C Crop improvement should be stopped for non-food crops.
    • D Yield growth in corn and soybeans is lower than that in rice and wheat.
    • E Food security can be ensured by increasing feed-grain production.
    • F They have favored crops used for animals and cars over staple crops that feed people.
    显示答案与解析 收起答案与解析

    正确答案：F

    该项准确改写了 preferentially focused、feeding animals and cars、crops that feed people，并保留了 over 的优先级对比。它不是泛泛地说研究不足，而是指出资源被错误地优先配置。障碍在于 cars 并非字面“吃作物”，它指向作物在燃料等用途上的使用；考生需要抓住作者设置的 people versus animals and cars 对照。

    引语两栏对照 直接扫描 第4段 中唯一的 efforts，并优先读引号里的句子，因为说明文的引语常浓缩研究者最鲜明的判断。不要花时间逐个翻译作物名称；用两栏符号 P（people）与 A/C（animals/cars）标注对象，再看正确项是否保留从 A/C 到 P 的优先级偏差，便能判定答案项。

  5. 第 5 段 定位词 more optimistic paper future farmland needs

    How does the report relate to the more optimistic paper on future farmland needs?

    • A It qualifies the paper's conclusion that little additional farmland will be needed.
    • B It fully confirms that no new farmland will ever be needed.
    • C It rejects the projection that the population will reach 9 billion in 2050.
    • D It argues that the Food and Agriculture Organisation produced the new paper.
    • E It predicts that farmland must expand before 2050.
    • F It focuses on the decline of population growth in wealthy countries.
    显示答案与解析 收起答案与解析

    正确答案：A

    该项保留了 qualifies 的准确语气，并将 will not have to dig up a lot more land 压缩为 little additional farmland will be needed。它既承认另一篇论文的乐观结论存在，也指出 report 并非无条件接受。障碍在于 qualify 在日常词汇中不如 reject 熟悉，考生容易把它误判为完全反对。

    谓语定研究关系 快速定位 第5段 的方法是扫描两个名词 paper 与 report 之间的谓语。该谓语 qualifies 已直接给出论证关系，不需要先处理 9 billion 或 FAO 的附加信息。随后以语气强度为唯一判据：正确项必须是“限制性认可”，不是 full support，也不是 total rejection。

  6. 第 6 段 定位词 return to forest or wilderness assumption weakens

    What assumption weakens the forecast that cropland may return to forest or wilderness?

    • A It assumes that population growth will speed up.
    • B It assumes that crop yields will continue to improve.
    • C It assumes that all cropland will become wilderness.
    • D It assumes that food demand will disappear by 2050.
    • E It assumes that corn and soybeans will replace wheat and rice.
    • F It assumes that food riots will no longer make news.
    显示答案与解析 收起答案与解析

    正确答案：B

    该项直接复现 forecast assumes continued improvements in yields，并准确回答“什么假设”而非“什么结果”。其削弱性来自下一层限定：这种 continued improvement may not actually happen。障碍在于题干使用 weakens，考生容易去找一个直接反对森林恢复的陈述；实际上作者攻击的是预测的基础条件。

    假设句框填空 在 第6段，看到题干的 assumption，跳过第一句的结果描述，直接扫读带 assumes 的句子；这是原文与题干的词形同根锚点。接着只看该句末的 may not actually happen，便可确认被质疑的前提。以“正确项是否能放入 forecast assumes ___”作句框测试，能通顺且被后文质疑的正确项就是答案项。

STRUCTURE · 篇章结构

5 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

    引出问题：作物产量增长放缓

    这个 opening paragraph 通过对比 food riots 和 hunger 这些 make news 的显性问题，引出一个被 rarely talked about 的 underlying trend——世界主要 crops 的 yield growth 出现 decline，并指出有 new study 将探讨这个 decline 发生的 where 和 how far

    这个 introductory section 在说明文中起到 hook the reader 的作用，通过指出一个 significant 但 underreported 的 agricultural problem，为后续展开 yield slowdown 的 detailed analysis 奠定 foundation

    提出研究对象
  2. P2

    研究发现：产量增速放缓的数据证据

    这个 data-presenting section 具体说明 authors 如何 take vast data points for four major crops（rice, wheat, corn, soybeans），并 reveal 关键 finding：在 24% to 39% 的 harvested areas，yield improvement 在 1980s 之前很好，但在 1990s and 2000s 出现 slowed down

    这个 evidence section 在说明文中起到 substantiate the claim 的作用，通过 present quantitative data 和 specific crops，让前面提出的 abstract problem 变得 concrete and measurable，为后续的 implication analysis 提供 factual basis

    提供核心数据
  3. P3

    担忧特征一：人口大国的自给自足受威胁

    这个 implication-analyzing section 指出 slowdown 的 first worrying feature：在 most populous countries 即 India and China 尤其 sharp。文中强调这两国的 ability to feed themselves 一直是 source of stability，但如果 yields continue to slow down or reverse，这种 self-sufficiency 就 cannot be taken for granted

    这个 consequence section 在说明文中起到 explain the significance 的作用，通过 focus on geographic dimension（populous nations）和 analyze the threat to food security，让 readers understand 为什么 yield slowdown 是 concerning，特别是对 global stability 的 potential impact

    阐述地域影响
  4. P4

    担忧特征二：主粮产量增长低于饲料作物

    这个 parallel implication section 指出 second worrying feature：wheat and rice 的 yield growth 低于 corn and soybeans。文中解释这 problematic 是因为 wheat and rice 作为 foods 更 important，accounting for half of all calories consumed，而 corn and soybeans 主要是 feed grains。Authors 批评我们 preferentially focused improvement efforts on feeding animals and cars 而非 crops that feed people

    这个 consequence section 在说明文中起到 deepen the analysis 的作用，从 crop type dimension 来 reveal 另一层 concern，并通过 contrast food crops vs. feed crops 来 highlight 一个 resource allocation problem，使 food security threat 的 analysis 更加 comprehensive

    阐述作物类型影响
  5. P5 P6

    对比研究：质疑乐观预测的前提假设

    这个 comparative evaluation section 包含两个 paragraphs，共同完成一个 rhetorical function：先在 第5段 提到 another paper 的 more optimistic findings（不需要 dig up more land to feed 9 billion people in 2050），然后在 第6段 通过 'Instead' 和 'The trouble is' 这些 contrasting signals 来 qualify 这个乐观结论——因为它 assumes continued improvements in yields which may not actually happen

    这个 concluding section 在说明文中起到 synthesize and warn 的作用，通过 juxtapose 乐观 forecast 和本文揭示的 yield slowdown reality，来 reinforce 文章的 central warning——我们 cannot take optimistic assumptions for granted。这让整个 exposition 形成 complete argumentative arc

    揭示预测的脆弱性
MAIN IDEA · 速判主旨

4 步定位这篇文章的主旨

不读完全篇也能锁定主旨——以下 4 步按2015年6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. 开头段落的问题陈述 P1

    说明文的 expository nature 决定了它需要先 establish what is being explained。Opening paragraph 里的 problem statement 或 phenomenon description 是 anchor point，它告诉读者这篇文章要 explain 什么。这个 problem 往往就是文章主旨的 subject matter。

  2. 研究数据与发现 P2

    说明文的 credibility 建立在 factual basis 上，所以作者必须提供 concrete evidence 来 demonstrate 问题的 existence 和 extent。这些 evidence 不仅 validate 开头提出的 problem，还会 narrow down 问题的 specific aspects，帮助我们 refine 对主旨的理解。

  3. 问题的严重影响 P3 P4

    说明文不仅要 present facts，还要 interpret 这些 facts 的 meaning 和 importance。作者对 implications 的 emphasis 揭示了文章的 underlying concern 和 main message。当作者用 evaluative terms 来 characterize certain aspects 时，这些 aspects 就是文章主旨的 critical components。

  4. 对乐观预测的质疑 P5 P6

    说明文的 concluding sections 会 tie together 前面讨论的各个 elements，并且常常会 question 或 qualify 其他 perspectives。当作者说 "qualifies the more optimistic findings" 或 "challenges forecasts" 时，这表明文章的 main thrust 是要 present a more sobering reality，这正是主旨的 essence。

主旨信号词 decline P1 worrying P3 cannot be taken for granted P3 qualifies P5 trouble P6

MAIN IDEA · 主旨

这篇文章在说什么

这篇说明文解释了自20世纪80年代以来,水稻和小麦等主要粮食作物产量增长放缓的令人担忧的趋势,特别是在中国和印度等人口大国,这威胁到全球粮食安全,并对无需扩大农田即可养活未来人口的乐观预测提出了挑战。
This expository article explains the concerning slowdown in crop yield growth for major staples like rice and wheat since the 1980s, particularly in populous nations like China and India, which threatens global food security and challenges optimistic forecasts about feeding future populations without expanding farmland.
WORD INFERENCE · 生词推断

6 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。

  • riot 骚乱;暴动

    现在让我们把所有线索串联起来。首先,riots 与 hunger 并列,说明它是同等严重的社会问题;其次,它能 make news,说明具有突发性和冲击性;最后,food 作为定语表明这是与食物相关的群体性事件。将这三条线索综合,我们可以推断:riots 是因食物问题引发的、具有冲击性的群体性事件,很可能是某种激烈的集体抗议或冲突行为。

    并列对等+功能定位+定语限定
  • yield 产量;收成

    让我们整合这些线索。首先,yields 属于 crops,在 harvested areas 中产生;其次,它可以被量化、比较,有 growth 和 decline;最后,yields 的高低决定了是否需要更多土地来养活人口。综合这些信息,yields 显然是指单位面积上作物的产量或产出。

    所属关系+动作特征+系统功能
  • populous 人口稠密的;人口众多的

    现在综合所有线索。从构词法看,popul- 词根和 -ous 后缀指向'充满人的';从举例看,India and China 是典型的 populous countries,这两个国家的共同特征就是人口众多;从逻辑关系看,populous countries 需要强大的 self-sufficiency in food,说明人口规模是关键特征。三条线索完美契合,指向同一个词义。

    构词假设+例证验证+逻辑确认
  • self-sufficiency 自给自足;自足

    让我们整合分析。从构词法看,self-sufficiency 字面意思是'自我充足';从同义复现看,它等同于 feed themselves 这个能力;从条件关系看,它表示不需要依赖外部就能满足需求的状态。三条线索共同指向一个核心概念:自给自足的能力。

    构词拆解+同义替换+逻辑验证
  • qualify 限定;修正;使有所保留

    整合两条线索。第一条告诉我们 qualify 是对某个 findings 做某种处理,且这个 findings 是乐观的;第二条通过 trouble 和 assumes 揭示了具体处理方式——指出乐观结论成立的前提条件。因此,qualify 在这里不是'使具有资格',而是'给...加上限定条件'或'修正'的意思。

    识别宾语+捕捉转折+学术语境调整
  • plough 犁地;耕地

    综合三条线索。首先,plough up 的目的是 for crops,结果是让土地能种植;其次,它与 revert to forest 对立,说明是改变土地的自然状态;最后,它与 dig up 功能相似,都是 farming 的准备工作。这些线索表明 plough 是一种翻整土地、使其适合耕种的农业操作,很可能就是犁地、耕地。

    目的结果+反义界定+近义验证
RHETORIC · 修辞手法

6 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。

  • 举例子

    P1

    文章开头用 food riots and hunger 作为 concrete examples 来引出背后更深层的 trend，也就是 crop yield slowdown。这种 specific to general 的写法让抽象的 agricultural crisis 变得 tangible and relatable，帮助 readers 理解为什么 yield decline 值得关注，即使它 rarely hits headlines。通过 familiar events 引出 underlying issue，这个 rhetorical move 有效建立了文章的 urgency 和 relevance。

    信号词 One example comes from For example For instance Take... as an example A case in point To illustrate Consider Such as including

    仿写： 当你想 introduce 一个复杂的 trend 或 phenomenon 时，不妨先抛出 readers 熟悉的 specific events。问自己：What visible manifestations 能让人立刻 relate to this issue？然后用 transitional phrase 比如 'but the trend behind...' 或 'one example comes from...' 来 pivot to 你真正想讨论的 deeper pattern。 仿写模版：[Familiar event/problem] make(s) news/attracts attention. But [underlying trend/cause] is rarely discussed/examined. This is [core issue you want to analyze].

  • 列数字

    P2

    作者用 '24% and 39%' 这个 quantitative range 来 precisely measure yield slowdown 的 extent，用 '1980s'、'1990s and 2000s' 这些 time markers 来定位 when the problem emerged。这些 numerical data 把 vague concern 转化为 measurable reality，让 'decline' 这个词不再是 subjective impression 而是 objective fact。对于说明文的 main point（crop yield crisis），这种 statistical evidence 提供了 irrefutable support，significantly strengthening 文章的 credibility 和 persuasiveness。

    信号词 between X% and Y% approximately nearly around more than less than X out of Y half of a quarter of doubled increased by

    仿写： 当你需要 demonstrate 某个 trend 或 phenomenon 的 severity 时，问自己：What can be measured here？是 percentage、time span、还是 absolute numbers？确保你的 figures 有 clear referent（39% of what exactly？）。用 ranges（24%-39%）比 single numbers 更显 rigor，因为它 acknowledges variability。在 present numbers 时，配合 contextual information（如 'before the 1980s' vs 'in the 1990s'）让 data 有 meaningful comparison。 仿写模版：[Subject] find(s)/show(s) that in [percentage/proportion] of [measured entity], [phenomenon] [changed/occurred] in [time period], compared to [baseline period].

  • 作比较

    P3 P4 P5 P6

    文章在多处进行 systematic comparisons：wheat/rice vs corn/soybeans 的 yield growth rates，food crops vs feed grains 的 importance，还有 optimistic forecasts vs actual yield trends。最关键的对比是 'feeding people' vs 'feeding animals and cars'，这个 sharp contrast 揭示了 agricultural priorities 的 misalignment。这些 comparisons 不只是 presenting facts，而是 highlighting contradictions 和 problematic choices，直接 serve 文章的 critical stance（我们的 crop improvement efforts 放错了重点）。通过 juxtaposition，作者让 readers 看到 what should be prioritized 和 what actually is prioritized 之间的 disturbing gap。

    信号词 more...than less...than while whereas in contrast compared to rather than unlike on the other hand however but

    仿写： 设计 comparison 时，先明确你的 evaluative purpose：是要 show superiority、reveal imbalance、还是 challenge assumptions？选择有 meaningful差异的 entities 来对比，并确保 comparison criteria 清晰（yield growth rate、caloric importance、resource allocation）。用 parallel structures 来 enhance readability：'X is more important as A...Y is more important as B'。最有力的 comparisons 往往 contain implicit judgment，通过 juxtaposition 本身就让 readers 得出结论，无需 explicit evaluation。 仿写模版：[Entity A] has been [comparative adjective] in [aspect X], while [Entity B] shows [comparative state] in [aspect Y]. This is problematic/significant because [explanation of implication].

  • 引资料

    P2 P4 P5

    文章明确提到 'A new study by the University of Minnesota and McGill University' 以及 'another new paper' 和 'the Food and Agriculture Organisation'，这些都是 authoritative sources。通过 citing academic research 和 international organizations，作者把 personal argument 建立在 established evidence base 上。特别是文中直接 quote 研究的发现（'we have preferentially focused...'），让 critical assessment 有了 scholarly backing。这种 citation strategy 对文章 main point 至关重要：yield slowdown 不是 speculation 而是 documented phenomenon，对此的 concern 也不是 alarmist 而是 evidence-based。

    信号词 A new study by according to research shows as X notes X argues that data from reports indicate scholars suggest evidence from X has found

    仿写： 使用 citations 时，要 strategically place them：在 introduce new data 或 controversial claims 时引用。明确 source identity（不只说 'a study' 而说 'a study by X University'）来建立 credibility。可以用 reporting verbs（find、suggest、note、argue）来 integrate sources smoothly。Direct quotations 应该用于 particularly striking phrases 或 precise technical terms，但不要 over-quote—paraphrase 更能显示你的 understanding。记得用 citations 不只是 borrow authority，还要 engage with them（agree、qualify、challenge）。 仿写模版：A [new study/report] by [authoritative institution] [reporting verb] that [key finding]. The authors [note/point out] that "[direct quotation if striking]".

  • 分类别

    P2 P3 P4

    文章把 crops 分成 'four most important'（rice、wheat、corn、soybeans），然后进一步 categorize 为 'food crops'（wheat and rice）vs 'feed grains'（corn and soybeans）。在讨论 slowdown 的 features 时，又分成 'One' 和 'Second' 两个 worrying aspects。这种 systematic categorization 让 complex agricultural data 变得 structured and digestible。通过把 crops 按 function 分类，作者能 precisely argue 哪些 categories 的 yield problems 更 critical（feeding people 的比 feeding animals 的更要紧）。这个 classification strategy 直接 support main point：我们需要 re-prioritize which crops to focus on。

    信号词 can be divided into fall into X categories there are X types of classified as grouped into One...Second First...Second include consist of

    仿写： 进行 classification 时，先确定你的 organizing principle（function、importance、chronology、geographical location）。确保每个 category 有 clear defining feature，并且 categories 之间的 boundaries 明显。用 explicit markers 来 signal classification：'can be divided into'、'fall into X categories'、numbered lists（'First...Second'）。在 present categories 后，要 explain why this particular way of grouping matters（比如本文用 food vs feed 的分类来 argue priorities）。好的 classification 不只是 organizing information，而是 revealing meaningful relationships。 仿写模版：[Subject] can be divided into [number] categories: [Category A] and [Category B]. [Category A] is characterized by [feature], while [Category B] shows [different feature]. This distinction is important because [implication].

  • 作诠释

    P3 P4 P6

    在 第3段，作者解释 'self-sufficiency cannot be taken for granted if yields continue to slow'，这是对 yield slowdown 的 deeper implication 的 elaboration。在 第4段，'This is problematic because...' 这个句子 clarifies 为什么 wheat/rice 的 slower growth 比 corn/soybeans 更 concerning。在 第6段，'This could happen. The trouble is...' 这组句子 qualifies and explains 前文提到的 optimistic forecast 的 limitations。这些 interpretative moves 不是简单 repeat facts，而是 unpack their significance，让 readers 理解 why these patterns matter。对 main point 而言，这些 explanations 把 statistical trends 转化为 policy implications 和 future risks。

    信号词 This is problematic because This means that The trouble is In other words That is to say This suggests The implication is What this means is Put simply

    仿写： 提供 interpretation 时，先 present the fact or observation，然后用 explanatory phrases（'This is problematic because...'、'The trouble is...'、'This means...'）来 introduce your elaboration。关键是 make explicit 那些对你 obvious 但 readers 可能 miss 的 connections。问自己：So what? Why does this matter? What are the consequences? 用 causal language（'if...then'、'cannot...if'）来 show logical relationships。但避免 over-explain—如果 implication 真的 obvious，简短 interpretation 就够了。 仿写模版：[Observation/fact]. This is [evaluative adjective] because [explanation of significance/implication]. [Optional: further elaboration of consequences].

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。

  • 问题的严重性被忽视

    P1
    Food riots and hunger make news. But the trend lying behind these matters is rarely talked about.

    对比类 never hit headlines / rarely talked about never hit headlines rarely talked about but however while whereas

    这个 implication 揭示了一个 paradox：显性的 crises（food riots）吸引 attention，但真正的 systemic problem（yield decline）却被 neglected。作者通过这个 contrast 为整篇文章 establish 了 urgency 和 significance，说明接下来要讨论的 crop yield slowdown 虽然不 sensational，但对 global food security 有 fundamental impact。这为文章主旨服务，因为它 justify 了为什么要深入研究这个 underreported issue，同时也 criticize 了 media 和 public attention 的 misallocation。

  • 产量增长放缓的范围令人担忧

    P2
    They find that in between 24% and 39% of all harvested areas, the improvement in yields that took place before the 1980s slowed down in the 1990s and 2000s.

    模糊限制语 between 24% and 39% approximately roughly around about nearly up to

    这个 percentage range 的 implication 是：无论按照 conservative estimate（24%）还是 higher estimate（39%），affected areas 的比例都 substantial。作者通过给出 range 而非 precise figure，既保持了 scientific accuracy，又让读者 grasp 问题的 magnitude。即使取 lower bound，nearly a quarter 的 harvested areas 出现 slowdown 已经是 significant concern。这支持文章主旨因为它用 quantitative evidence 证明了 yield decline 不是 isolated incidents 而是 widespread phenomenon，从而 justify 文章开头说这是被 underreported 的 major problem。

  • 自给自足能力面临威胁

    P3
    That self-sufficiency cannot be taken for granted if yields continue to slow down or reverse.

    委婉表达 cannot be taken for granted may not might not could be at risk raises questions about casts doubt on challenges the assumption

    这个 implication 指出中国和印度的 food self-sufficiency，原本是 global stability 的 cornerstone，现在正 facing serious threat。作者用 cannot be taken for granted 这种 understated way 传递一个 alarming message：这两个 most populous countries 可能从 food exporters 或 self-sufficient states 变成 net importers，这会 destabilize world food markets。这个 implication 对文章主旨至关重要，因为它 elevate 了 yield slowdown 从 agricultural issue 到 geopolitical concern，说明这不仅是 farming problem 而是关乎 global food security 和 international stability 的 critical issue。

  • 资源配置的价值错位

    P4
    we have preferentially focused our crop improvement efforts on feeding animals and cars rather than on crops that feed people and are the basis of food security

    对比类 preferentially / rather than rather than preferentially instead of at the expense of prioritize X over Y focus on X while neglecting Y

    这个 implication 是全文最 explicit 的 criticism：农业研发的 resource allocation 存在根本性 misalignment。作者通过 juxtapose feeding animals and cars（biofuels）与 feeding people，揭示了一个 ethical 和 practical problem：我们把 crop improvement efforts 投入到 less essential purposes（livestock feed, ethanol）而非 direct human consumption。这对文章主旨的作用是提供了 causal explanation：为什么 wheat and rice yields 增长慢于 corn and soybeans？因为 research priorities 错位。同时这个 implication 也 introduce normative dimension，暗示需要 reorient agricultural research towards staple crops that directly 支撑 food security。

  • 乐观预测的前提存疑

    P5
    The report qualifies the more optimistic findings of another new paper

    让步类 qualifies questions challenges complicates casts doubt on tempers moderates

    这个 implication 创建了两个 competing narratives 的 tension：一个 optimistic paper 认为不需要 expand farmland，而作者的 report qualifies 这个乐观预测。Qualify 这个词很关键——不是完全 reject 而是说 there are conditions。接下来第六段揭示这个 condition：optimistic forecast assumes continued yield improvements。作者的 implication 是：如果 yields 不继续提高（而根据前面数据，yields 正在 slow down），那个乐观预测就 collapse。这对文章主旨的作用是 synthesize 全文论证：yield decline 不仅是 current problem，还 undermine future food security projections，使原本 reassuring 的 forecasts 变得 unreliable。

  • 乐观预测的脆弱假设

    P6
    The trouble is that the forecast assumes continued improvements in yields, which may not actually happen.

    情态词 may not actually happen may not might not may not actually could fail to unlikely to questionable whether

    这是全文最 conclusive 的 implication：那个 reassuring forecast（不需要开垦更多土地）建立在一个 fragile assumption 上（yields 持续提高），而根据文章前面展示的 data，这个 assumption 正在被 reality undermined。May not actually happen 这个 understatement 实际传递很 strong message：基于前面 24-39% harvested areas 的 yield slowdown，continued improvements 很可能不会发生。这个 implication 是文章的 culmination，它将所有 evidence 整合成一个 coherent argument：yield decline 是 present reality，它不仅 threaten current food security，还 invalidate 关于 future 的 optimistic projections，因此这个被 media 忽视的 trend 实际上是 extremely consequential for global food security。

AUTHOR ATTITUDE · 作者态度

作者态度：消极批判

结论先行：本文作者态度为消极批判（ concerned and cautionary）。下面是按步骤还原的判断过程与文中的态度信号词。

  1. 开篇问题定调 P1

    说明文的 author 如果在 opening 就用 'significant problems'、'rarely talked about'、'decline' 这类 words，说明他想 alert readers 到某个 worrying trend，这是 critical attitude 的第一个 signal。

  2. 数据后评价性用词 P2 P3 P4

    在 第2段 和 第3段 中，author 不只是说 'yields slowed'，还说这是 'worrying features'，这种 explicit evaluation 表明他不是 neutral reporter，而是 concerned commentator。

  3. 直接批评表述 P4 P5

    在 第4段 和 第5段 中，author 明确 criticize 了 priorities（'preferentially focused on feeding animals and cars'）并且 qualify 了 optimistic findings，这是 critical stance 的 direct evidence。

  4. 全文基调一致性 P1 P2 P3 P4 P5 P6

    把三个 layers 的 evidence 结合起来，我们看到 consistent negative tone throughout the article：从 'problems never hit headlines' 到 'worrying features' 到 'the trouble is'，author 在每个 stage 都在 emphasize concerns，这是典型的 critical explanatory writing。

文中的态度信号词

  • worrying P3

    'Worrying' 这个 adjective 直接 reveal 了 author's emotional response to the data。在说明文中，这种 explicitly negative evaluation 表明 author 不是 neutral observer，而是想 convey urgency and concern。

    同类词 troubling alarming concerning disturbing distressing

  • problematic P4

    'Problematic' 是 strong evaluative term，author 用它来 directly label 某个 situation 为 problem。这比 neutral description 强烈得多，显示 author 对 current priorities 持 disapproving attitude。

    同类词 troublesome questionable undesirable concerning unsatisfactory

  • the trouble is P6

    'The trouble is' 是 explicit problem-introducing phrase，author 用它来 flag 他认为的 flaw 或 risk。这个 phrase 直接 signal 了 author's disagreement 或 skepticism about 前面提到的 optimistic view。

    同类词 the problem is the concern is unfortunately regrettably the issue is

  • decline P1

    'Decline' 在 opening paragraph 就 establish 了 negative trajectory。在说明文中，author 选择用 'decline' 而不是 neutral words like 'change'，说明他 view 这个 trend negatively。

    同类词 deterioration downturn slowdown reduction decrease

  • preferentially focused on P4

    'Preferentially focused on' 后面接着的是 author's criticism of misplaced priorities。这个 phrase 本身是 neutral，但 context 中它 introduce 了 author 认为的 wrong choice，显示他的 disapproval。

    同类词 prioritized emphasized at the expense of favored over chose to focus on

  • qualifies P5

    'Qualifies' 表明 author 在 moderate 或 challenge 另一个 study 的 optimistic findings。这个 verb 显示 author 持 skeptical stance toward 那些 findings，认为它们过于 optimistic。

    同类词 challenges contradicts casts doubt on questions disputes

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. 开篇是否引入说明对象 P1

    说明文的 characteristic feature 是开篇就 present 一个客观存在的 subject matter，比如本文的 'decline in the growth in yields of crops'。这不同于议论文会先抛出 controversial opinion 或 debatable claim，也不同于新闻报道会用 breaking news 或 specific event 开头

  2. 内容以客观数据说明为主 P2 P3 P4

    本文第二段 presents 'a vast number of data points' 和 specific percentages，这是典型的 expository approach。说明文依靠 objective information 来 explain，议论文会用 evidence 来 support arguments 但核心是 persuade，新闻报道虽然也有 facts 但侧重 who、when、where 的 immediacy

  3. 采用逐层说明的展开结构 P2 P3 P4 P5 P6

    本文从 describe the decline (第2段) 到 analyze worrying features (第3段, 第4段) 再到 discuss implications (第5段, 第6段)，这是说明文的 typical progression。议论文会遵循 claim → evidence → rebuttal → conclusion 的 argumentative structure，新闻报道遵循 inverted pyramid 把 most important information 放最前

  4. 作者保持客观说明立场 P1 P3 P4 P5 P6

    本文虽然提到 problems 和 concerns，但 author 保持 observer role，只是 present findings 和 point out issues，没有 explicitly argue for a specific policy 或 solution。议论文会有明确的 thesis statement 和 concluding call，新闻报道虽然也 neutral 但会强调 timeliness 和 newsworthy events

  5. 综合识别说明文特征组合 P1 P2 P3 P4 P5 P6

    本文完整展现了说明文的 defining features：客观的 topic introduction (第1段)，基于 research data 的 factual explanation (第2段)，层层递进的 analytical structure (第3段-6)，以及始终保持的 informative tone without advocacy。这些 characteristics 共同构成了说明文的 genre fingerprint

哪些词暴露了说明文体裁？

  • One example P1 举例说明类标记词（例证词） for example for instance such as like including
  • the four most important crops: rice, wheat, corn and soybeans P2 定义列举类标记词（分类说明词） : namely which are consists of known as
  • There are two worrying features P3 顺序列举类标记词（说明顺序词） There are two... One is... Second, First, Another
  • accounting for around half of all calories consumed P4 属性功能描述类标记词 accounting for serves as functions as is used as is characterized by
SENTENCE INSIGHTS · 句子精讲

9 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 2015年6月英语四级真题第1套 Part III Section C (1) 的常见问题

2015年6月英语四级真题第1套 Part III Section C (1) 文章的主旨是什么？
2015年6月英语四级真题第1套 Part III Section C (1) 文章说明文解释了自20世纪80年代以来,水稻和小麦等主要粮食作物产量增长放缓的令人担忧的趋势,特别是在中国和印度等人口大国,这威胁到全球粮食安全,并对无需扩大农田即可养活未来人口的乐观预测提出了挑战。（英文表述：This expository article explains the concerning slowdown in crop yield growth for major staples like rice and wheat since the 1980s, particularly in populous nations like China and India, which threatens global food security and challenges optimistic forecasts about feeding future populations without expanding farmland.）
2015年6月英语四级真题第1套 Part III Section C (1) 文章是什么体裁？难度如何？
体裁为说明文，作者立场是消极批判（concerned and cautionary）。CEFR 难度 C1，全文 349 词、6 段；在英语四级全部 511 篇真题文章中，C1 级共 163 篇（占 32%）。
2015年6月英语四级真题第1套 Part III Section C (1) 文章的篇章结构是怎样的？
全文 6 段按说明文骨架分为 5 个意群：第1段——引出问题：作物产量增长放缓；第2段——研究发现：产量增速放缓的数据证据；第3段——担忧特征一：人口大国的自给自足受威胁；第4段——担忧特征二：主粮产量增长低于饲料作物；第5段、第6段——对比研究：质疑乐观预测的前提假设。
2015年6月英语四级真题第1套 Part III Section C (1) 文章的作者态度是什么？
作者态度是消极批判（concerned and cautionary）。判断路径：开篇问题定调 → 数据后评价性用词 → 直接批评表述 → 全文基调一致性；文中的态度信号词包括 worrying（第3段）、problematic（第4段）、the trouble is（第6段）、decline（第1段）、preferentially focused on（第4段）、qualifies（第5段）。
2015年6月英语四级真题第1套 Part III Section C (1) 文章中有哪些值得积累的生词？
按文中出现顺序共 6 个：riot（骚乱;暴动）、yield（产量;收成）、populous（人口稠密的;人口众多的）、self-sufficiency（自给自足;自足）、qualify（限定;修正;使有所保留）、plough（犁地;耕地），每个词的词义都可以由文中上下文线索推断得出。

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