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2021年12月英语四级真题第2套 Part II Section C (2)
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2021年12月英语四级真题第2套 Part II Section C (2)

说明文 · 听力 · 真题文章逐层精读

本页是 2021年12月英语四级真题第2套 Part II Section C (2) 文章的精读视角页——这篇说明文全文 240 词、3 段，CEFR 难度 B2（B2 级在英语四级文章中占 46%），作者立场为「积极支持」；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

3 段英文原文

以下为2021年12月英语四级真题第2套 Part II Section C (2) 的听力原文，共 3 段。左侧 P1–P3 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。

"One 60-minute run can add seven hours to your life." This was a claim made by The Times last week. The claim was based on a new review of studies about the effects of running. The review concluded that on average runners live three years longer than non-runners and that running does more to extend life than any other form of exercise. But there's more to running than its health benefits. Research published in recent years has shown that running changes your brain and mind in some fascinating ways, from increasing your brain function to regulating your emotions. However, the precise effects vary according to whether you engage in short, fast running or long-distance running.

For example, in one study, researchers compared participants' ability to learn new words after several minutes of intense running and after 40 minutes of gentle running. Participants were able to learn 20 percent faster after the intense running and they showed a superior memory when tested again a week later.

In another study, researchers asked volunteers to jog for 30 minutes and then showed them clips from a sad movie. Participants who usually struggled to handle negative emotions were more intensely affected by the sad clips, just as you'd expect. But crucially, this was less so if they had completed the 30-minute jog. The researchers said moderate exercise appears to have helped those participants to be less vulnerable to the impact of the sad movie.

PARAGRAPHS · 逐段精读

3 段逐段主旨与解读

逐段拆解2021年12月英语四级真题第2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

    How Running Changes Body and Mind

    Running benefits lifespan, cognition, and emotion, but its mental effects depend on the type of running.

    本段承担 introduction 的功能，它先用 longevity 吸引读者，再把文章主旨推进到 cognitive 和 emotional benefits，并提出 intensity 与 duration 这一全文的比较维度。

    抓转折后的分类线索
  2. P2

    Intense Running Boosts Learning and Memory

    Short, intense running enhances vocabulary learning and long-term memory.

    本段是对首段中 short, fast running 效果的首个具体证明，它以词汇学习实验支撑文章主旨中的 cognitive benefits，使概括性的论断变得可验证、可量化。

    实验对比锁定结果
  3. P3

    Jogging Helps Regulate Negative Emotions

    Moderate jogging helps emotionally vulnerable people regulate negative emotions.

    本段对应首段所说的 emotional benefits，并以 moderate jogging 的案例与上一段的 intense running 形成对照，从而完整证明不同 intensity 和 duration 会带来不同的 mental effects。

    紧盯关键转折后的发现
SELF CHECK · 段落自检题

3 道逐段细节自检题

针对2021年12月英语四级真题第2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 precise effects brain and mind

    What does the passage say determines the precise effects of running on the brain and mind?

    • A The number of years that running adds to a person's life.
    • B Whether a person is a runner or a non-runner.
    • C Whether the running is short and fast or long-distance.
    • D How much running exceeds every other form of exercise.
    • E The age at which a person begins running.
    • F The researcher's method of measuring brain function.
    显示答案与解析 收起答案与解析

    正确答案：C

    原文用 whether ... or ... 直接回答了 precise effects 的决定条件，语义关系完全对应题干中的 determines。该项没有重复列举某个 brain function 或 emotion，而是准确保留了原文的分类维度。障碍在于命题人将 short, fast running 与 long-distance running 压缩为两个平行类别；考生若只记住 running is beneficial，便会错过这个限定。

    转折后条件句 时间紧张时，直接抓题干中最稀有的组合 brain and mind，并在 第1段 内向后扫读 precise 及其后的连接结构；不要从首句数字开始顺读。随后把每个选项先贴上“条件、结果、比较、无依据”标签，只有逻辑标签与 determine 一致且文本复现的正确项才保留。这种先做逻辑分类、后做词义比对的方法，比逐项全文核对更快。

  2. 第 2 段 定位词 intense running word-learning study

    What did the participants demonstrate after intense running in the word-learning study?

    • A They learned new words 20 percent faster after gentle running.
    • B They showed superior memory immediately after a 40-minute run.
    • C They learned words more slowly but remembered them for a longer time.
    • D They learned new words 20 percent faster and had better memory a week later.
    • E They performed best when both running sessions lasted 40 minutes.
    • F They became less vulnerable to negative emotions.
    显示答案与解析 收起答案与解析

    正确答案：D

    该项完整对应两层实验结果：20 percent faster 对应即时学习速度，better memory a week later 对应延后记忆测试。它既保留了关键数字，也保留了时间限定。障碍在于原文的 superior memory 和选项的 better memory 是同义改写，考生不能因没有原词 superior 而排除它。

    双钩结果核验 最快的入口是题干中的 intense running 加 word-learning，而非先读所有选项；这两个词将你直接带到 第2段 的对比实验。随后采用“双钩核验”：给正确项同时钩住 percentage 与 delayed test，任何选项只钩到一个数字、一个时间或一个结果都暂不选。正确项是唯一能同时完成两次钩连的选项。

  3. 第 3 段 定位词 30-minute jog handling negative emotions

    How did a 30-minute jog affect participants who usually had difficulty handling negative emotions?

    • A It made them more intensely affected by the sad clips.
    • B It completely prevented them from feeling negative emotions.
    • C It enabled them to learn new words 20 percent faster.
    • D It showed that they were no longer affected by sad movies.
    • E It made them less vulnerable to the impact of the sad movie.
    • F It affected only participants who could already handle negative emotions well.
    显示答案与解析 收起答案与解析

    正确答案：E

    原文先说明这类 participants 通常会 be more intensely affected，随后通过 But crucially 指出完成 jog 后这种影响 less so，并由 researchers 概括为 less vulnerable。正确项准确呈现了从较易受影响到较不易受影响的变化。障碍在于选项没有照抄 less so，而是采用 impact of the sad movie 的完整表达，要求考生整合前后两句。

    转折前后箭头 在 第3段 中，用题干的 30-minute jog 先落点，再采用“前后箭头法”：把 usually 所描述的方向记为基线，扫描 But crucially 后方向是否反转或减弱。然后优先选择与后半句方向、程度和对象都一致的正确项，不必逐字翻译整段。该法特别适合处理带转折的实验结论。

STRUCTURE · 篇章结构

3 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

    引出话题并揭示跑步的多维价值

    这个意群通过 a claim 引入 running 这个 topic，先提到 extend life 的 health benefits，然后用 but there's more to 进行 transition，强调 running 不仅有 physical benefits，还能 change your brain and mind，产生 cognitive and emotional effects，最后点明 effects vary 取决于 running type

    作为 expository writing 的 introduction part，这个意群通过 general statement 建立了文章的 framework，用 health claim 作为 hook 吸引 attention，然后通过 however 引出 main focus 即 cognitive and emotional benefits，并为后文的 specific examples 做好 logical preparation

    总领全文内容
  2. P2

    例证短时高强度跑步的认知增益

    这个意群用 for example 明确标记 exemplification，通过 one study 提供 concrete evidence，对比 intense running 和 gentle running 对 learning new words 的 effect，用 specific data（20 percent faster）和 time frame（a week later）来 demonstrate 短时高强度跑步的 cognitive benefits，特别是在 learning and memory 方面的 enhancement

    作为 body paragraph 的第一个 supporting section，这个意群通过 empirical research 将前文提到的 brain function 概念 concretize，用 comparative study design 和 quantitative results 增强 persuasiveness，同时呼应了意群1中 effects vary 的观点，开始 elaborate 不同 running types 的 specific impacts

    例证认知益处
  3. P3

    例证中等强度跑步的情绪调节作用

    这个意群用 in another study 标记 parallel example，shift focus 到 emotional regulation 这个 different dimension。通过 experimental design（30-minute jog + sad movie clips）来 examine moderate exercise 对 negative emotions 的 impact，特别关注 vulnerable individuals，用 less intensely affected 和 less vulnerable 来 demonstrate jogging 的 protective effect against emotional distress

    作为第二个 supporting section，这个意群 complement 前一个例子，从 cognitive 转向 emotional dimension，继续 substantiate 主旨中的 emotional benefits。它与意群2形成 parallel structure，共同 illustrate 跑步的 multi-faceted brain effects，同时再次 reinforce 意群1提到的 effects vary 观点，因为这里 focus on moderate exercise 而非 intense running

    例证情绪益处
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2021年12月英语四级真题第2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. 首段首尾句定位主题与范围 P1

    说明文的首段通常会在开头提出 topic，在结尾揭示 focus 或 transition。这篇文章首句用 claim 引出 running 的 health benefits，末句用 however 转折指出 precise effects vary，暗示后文会详细说明 different types of running 的 different effects

  2. 并列结构预示多维展开 P1

    首段提到 running changes your brain and mind in fascinating ways，紧接着用 from...to... 结构列举 increasing brain function 和 regulating emotions 两个方面，这是典型的 multi-aspect enumeration，预示后文会分别展开 cognitive benefits 和 emotional benefits

  3. 中间段例证验证首段预告 P2 P3

    第二段开头 For example 和第三段开头 In another study 都是 exemplification markers，表明文章用 empirical studies 来 support claims。第二段聚焦 intense running 对 learning 的影响，第三段聚焦 moderate jogging 对 emotional regulation 的作用，印证了首段预告的 effects vary according to intensity

  4. 三层整合形成完整主旨 P1 P2 P3

    首段提出 running extends life 和 changes brain and mind，中间两段分别用 studies 证明了 cognitive enhancement（learn faster, superior memory）和 emotional regulation（less vulnerable），且强调 effects vary by intensity。主旨应涵盖 lifespan extension, cognitive and emotional benefits, 以及 variation by intensity

主旨信号词 extend life P1 changes your brain and mind P1 however P1 vary according to P1 For example P2 learn faster P2 In another study P3 less vulnerable P3 intense running P2 moderate exercise P3

MAIN IDEA · 主旨

这篇文章在说什么

跑步可以延长寿命并提供显著的认知和情绪益处。研究表明,高强度短期跑步能增强学习和记忆能力,而适度慢跑有助于调节负面情绪,具体效果因跑步强度和持续时间而异。
Running extends lifespan and provides significant cognitive and emotional benefits. Research shows that intense short-term running enhances learning and memory, while moderate jogging helps regulate negative emotions, with effects varying based on running intensity and duration.
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。

  • regulate 调节、控制

    让我们 connect all the clues together。首先，从 sentence structure 来看，regulating 和 increasing 形成 parallel structure，暗示它也是一种 positive effect。然后，第3段 的 specific experiment 展示了 running 如何帮助人们 better handle negative emotions，让他们 less vulnerable to sad stimuli。最后，morphological analysis 告诉我们 regulate 和 regular 有 shared root，与 order 和 control 的概念相关。综合这三条 clues，我们可以得出：regulate 指的是对某事物（这里是 emotions）进行 systematic control 或 management，使其保持在 appropriate level，不会过于 extreme。

    结构-实例-词根三维推断法
  • vulnerable 易受伤害的、脆弱的

    让我们 synthesize these clues。从 causal logic 看，exercise 作为 protective factor 使人 less vulnerable，说明 vulnerable 是一种 need protection 的状态。从 sentence context 看，那些 struggle to handle negative emotions 的人 more intensely affected，exercise 降低了这种 susceptibility。从 morphology 看，-able suffix 表示 capacity，vulner- 与 harm 相关。综合起来，vulnerable 描述的是一种 易受外界影响或伤害、缺乏抵抗力 的特质。在这个 specific context 中，指的是 easily affected by negative emotional stimuli。

    对立关系加词缀反推法
  • intense 强烈的、剧烈的

    通过 combining two contextual clues，我们可以 clearly see intense 的含义。在 第2段 中，intense 与 gentle 形成 antonym pair，加上 time contrast（several minutes vs. 40 minutes），表明 intense 描述的是 high degree 或 great strength。在 第3段 中，intensely 修饰 emotional reaction，描述的是 strong 和 powerful 的 response。两处 usage 都指向同一个 core meaning：强度大、程度深、力量强。

    对比验证加多处印证法
  • moderate 适度的、中等的

    结合 contextual evidence 和 morphological analysis，moderate 的含义变得清晰。从 第1段 到 第3段 的 progression 来看，文章讨论了不同 types 和 durations 的 running。30-minute jog 作为 moderate exercise，位于 intensity spectrum 的 middle position。Morphologically，moder- root 本身就暗示 balance 和 avoidance of extremes。因此，moderate 描述的是一种 适度的、不过分的、保持中庸 的特质，既不太强也不太弱。

    光谱定位加词根验证法
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 P3

    文章开头 quote 了一个 precise figure："One 60-minute run can add seven hours to your life"，这个 quantitative statement 直接用 numerical contrast 来 demonstrate running 的 life-extending effect。接着提到 runners 平均 live three years longer，再用 20 percent faster learning speed 和 40 minutes、30 minutes 这些 specific time frames 来 support 不同 running types 的 cognitive benefits。这些 concrete numbers 让 abstract health benefits 变得 tangible and convincing，强化了 running 对 lifespan 和 brain function 的 measurable impact，精准支撑了文章的 central argument。

    信号词 60-minute seven hours three years 20 percent 40 minutes 30 minutes one study another study

    仿写： 当你要 explain 某个 phenomenon 的 significance 时，问自己：能否用 quantifiable data 来 illustrate？比如讨论 sleep deprivation 的 harm，不要只说 "affects performance"，而要说 "reduces productivity by 30%" 或 "increases error rate from 2% to 15%"。Numerical comparisons 最有 impact，like "X is three times more effective than Y"。模版："[Action] can [verb] [specific number/percentage] [unit/outcome]. Research shows that [specific time/amount] of [activity] leads to [numerical improvement] in [measured aspect]."

  • 举例子

    P2 P3

    文章用 "For example" 和 "In another study" 明确 introduce 了两个 concrete research examples。First example 对比 intense running 和 gentle running 对 learning new words 的 different effects，用 participants' actual performance data 来 demonstrate 短时高强度 running 的 cognitive advantage。Second example 展示 moderate jogging 如何 help regulate emotional responses to sad content。这两个 specific cases 把 abstract claim "running changes your brain and mind" 变成 verifiable scenarios，让 theoretical benefits 有了 real-world application context，perfectly illustrate 了 intensity-dependent effects mentioned in the thesis。

    信号词 For example For instance In another study one study such as like take...for example to illustrate as an illustration

    仿写： 当你 present 一个 general principle 或 broad finding 时，立即 follow up with "For example" 或 "For instance"。Choose examples that are specific, relatable, and directly relevant。Structure 应该是：general statement → transitional phrase → detailed example → link back to main point。比如写 "Social media affects mental health"，接着 "For example, a 2019 study found that teenagers who spent more than 3 hours daily on Instagram reported 25% higher anxiety levels"。模版："[General claim]. For example/instance, in one study/case, [specific subjects] [specific action] and [specific result], demonstrating that [connection to main point]."

  • 作比较

    P1 P2

    文章 systematically compares different types of running 来 reveal their distinct effects。First comparison contrasts "short, fast running" versus "long-distance running" 对 brain 的 varying impacts。Second comparison 在 第2段 直接 compare "intense running" (several minutes) 和 "gentle running" (40 minutes) 对 learning ability 的 different outcomes。还有 runners vs. non-runners 的 lifespan comparison，running vs. other forms of exercise 的 life-extension effectiveness。这些 systematic comparisons 不仅 highlight running's superiority，更重要的是 reveal the nuanced principle：exercise effects are intensity-dependent。Comparison 让 readers understand not just "running is good" but "which type suits which purpose"，deepening the thesis about running's varied brain-changing mechanisms。

    信号词 compared than versus while whereas in contrast on the other hand different vary according to more...than less...than

    仿写： 当 presenting multiple options 或 discussing effects of different approaches 时，structure your comparison systematically。Use parallel structure 来 ensure clarity："A does X, while B does Y" 或 "Compared to A, B shows..."。明确 comparison 的 basis (time, intensity, outcome)。比如写 "Online learning vs. traditional classroom"，specify "In terms of flexibility, online courses allow..., whereas traditional classes require..."。Avoid vague comparisons；quantify when possible。模版："While [Option A] [action/characteristic], [Option B] [contrasting action/characteristic]. Compared to [A], [B] [shows/demonstrates] [specific difference] in [measured aspect]."

  • 引资料

    P1 P2 P3

    文章开篇 directly cites The Times 的 claim 来 establish initial credibility，然后 references "a new review of studies" 作为 evidence base。第2段 和 第3段 都明确提到 "in one study" 和 "researchers compared/asked"，showing that conclusions are derived from peer-reviewed research rather than speculation。这种 extensive citation pattern 建立了 scientific authority，让关于 running's cognitive and emotional benefits 的 claims 变得 trustworthy and verifiable。引资料不仅 supports 文章 thesis，更重要的是 signal 这是 evidence-based exposition rather than opinion piece，reinforcing the credibility of the intensity-dependent effects argument。

    信号词 based on according to research shows studies show researchers found published in one study review concluded evidence suggests experts say

    仿写： 在 making significant claims 时，immediately cite authoritative sources。Use phrases like "According to [source]" 或 "Research published in [journal/year] shows"。Be specific about source type (study, review, expert statement) 而非 vague "some research"。引用要 strategic：开头用 high-impact claim to hook readers，body paragraphs 用 detailed studies to support specific points。记得 integrate citations smoothly into your narrative rather than dropping them abruptly。模版："According to [source], [claim]. Research published in [context] has shown that [finding]. In one study, researchers [action] and found that [result]."

  • 分类别

    P1

    文章在 第1段 结尾 explicitly categorizes running into two types："short, fast running" 和 "long-distance running"，并 emphasize "the precise effects vary according to whether..."。这个 classification 成为后续 paragraphs 的 organizational framework。第2段 explores intense (short) running's cognitive benefits，第3段 examines moderate (longer duration) running's emotional regulation effects。这种 systematic categorization 让复杂的 "running changes your brain" 变得 structured and comprehensible，帮助 readers understand 不仅是 "running is beneficial" 而是 "different types serve different purposes"，perfectly supporting the thesis about varied brain-changing effects。

    信号词 vary according to can be divided into falls into categories types kinds classified as two types including such as

    仿写： 当 discussing a complex topic with multiple dimensions 时，establish clear categories early。Use explicit language like "can be divided into", "falls into X categories", "varies according to"。确保 categories are mutually exclusive and collectively exhaustive。为每个 category provide dedicated analysis or examples。Structure 应该是：introduce overall topic → establish classification criteria → present categories → explore each systematically。比如写 "stress management techniques"，可以 categorize as "physical (exercise), mental (meditation), social (support groups)" 然后 elaborate each。模版："[Topic] can be divided/categorized into [number] types: [category 1] and [category 2]. The effects/characteristics vary according to [criteria]. [Category 1] [specific traits], while [category 2] [different traits]."

IMPLIED MEANING · 言外之意

4 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。

  • 跑步益处不止健康层面

    P1
    But there's more to running than its health benefits.

    转折类 But there's more to but however yet nevertheless nonetheless still

    这个 implicature 的 underlying message 是：虽然 longevity benefits are impressive，但 the cognitive and emotional effects 才是 the real story here。作者 deliberately uses 'more to' 来 downgrade the importance of health benefits（尽管 paragraph 开头 spent considerable space on them），实际上是在 set up a rhetorical hierarchy。这对 article thesis 的 role 是 crucial 的，因为它 establishes the framework for subsequent paragraphs—告诉 readers 接下来的 specific studies about learning and emotion regulation 才是 the core evidence。这种 strategic positioning 让 thesis 从 'running extends life' expand to 'running transforms mental function'，significantly broadening the scope and depth of the argument。

  • 效果因跑步类型而异

    P1
    However, the precise effects vary according to whether you engage in short, fast running or long-distance running.

    转折类 However however but yet nevertheless nonetheless still

    这个 implication 是在 warn readers：'don't expect uniform results'。作者 uses 'however' 来 introduce a critical nuance—running 不是 one-size-fits-all solution，the benefits are contingent on exercise modality。这 serves the thesis by adding scientific rigor and credibility；它 prepares readers for the comparative evidence in subsequent paragraphs（intense vs. moderate running）。Without this qualifier，the article would risk oversimplification。这个 implicature essentially says: 'the general claim is true，但 the devil is in the details'，prompting readers to pay attention to specific conditions，which aligns perfectly with the evidence-based nature of expository writing。

  • 短时高强度跑步效果更显著

    P2
    Participants were able to learn 20 percent faster after the intense running and they showed a superior memory when tested again a week later.

    数据对比类 20 percent faster 20 percent twice as three times significantly more markedly higher considerably greater

    这个 statistical comparison 的 underlying message 是：intense running is demonstrably more effective for cognitive enhancement than moderate exercise。'20 percent faster' provides concrete proof，而 'superior memory' adds qualitative reinforcement。The implicature supports the thesis by offering empirical evidence for the 'precise effects vary' claim from 第1段。它 demonstrates that not all running is equal—intensity matters for specific outcomes。这个 finding 的 value 是 it gives readers actionable insight：if your goal is learning enhancement，choose high-intensity intervals。这种 specificity 让 the article transcend generic 'exercise is good' advice，providing nuanced, evidence-based guidance that distinguishes this exposition from surface-level health writing。

  • 情绪调节效果因人而异

    P3
    Participants who usually struggled to handle negative emotions were more intensely affected by the sad clips, just as you'd expect. But crucially, this was less so if they had completed the 30-minute jog.

    预期确认后的转折强调类 just as you'd expect. But crucially crucially critically importantly significantly notably remarkably

    这个 implicature 的 core message 是：moderate jogging acts as an emotional buffer for vulnerable individuals。'Just as you'd expect' validates that emotional vulnerability is real，而 'but crucially, this was less so' reveals running's protective effect。The phrase 'less vulnerable' implies running doesn't eliminate emotional response，但 moderates its intensity—这种 nuanced claim 比 'running fixes emotions' 更 credible and scientifically sound。For the thesis，这个 finding demonstrates emotional regulation as a concrete benefit，complementing the cognitive benefits from 第2段。Together，they support the overarching claim that running's mental effects are diverse and substantive。这个 implicature 的 value 还在于 it highlights personalized benefits—helping those who 'usually struggled'，suggesting running may be particularly valuable for specific populations，adding practical relevance to the scientific exposition。

AUTHOR ATTITUDE · 作者态度

作者态度：积极支持

结论先行：本文作者态度为积极支持（ informative and positive）。下面是按步骤还原的判断过程与文中的态度信号词。

  1. 开篇语言客观性 P1

    第一段的 opening 直接引用了 The Times 的 claim，然后用 based on a new review 来支撑，这种 evidence-based presentation 表明作者在 objectively reporting scientific findings，而不是 subjectively arguing a point，但后续用了 fascinating ways 这样的 positive descriptors，暗示了 favorable attitude。

  2. 动词确定性程度 P1 P2 P3

    文中大量使用了 concluded、shown、compared、showed 这些 definitive verbs，没有用 may、might、potentially 这类 hedging words，说明作者对 research results 持 confident attitude，认为这些 findings 是 reliable and valid 的。

  3. 情感色彩词识别 P1 P2 P3

    作者用了 fascinating 来形容 running changes brain and mind，用 superior memory 来描述 test results，用 crucially 来强调 jogging 的 protective effect，这些 positive evaluations 清晰地表明作者对 running benefits 持 appreciative attitude，而不是 neutral reporting。

  4. 论据选择平衡性 P1 P2 P3

    全文三段都在 present positive effects of running：life extension、learning enhancement、emotional regulation，没有提及 potential risks、limitations 或 conflicting evidence。这种 selective presentation of favorable evidence 表明作者的 purpose 不是 balanced analysis，而是 promoting running benefits。

  5. 多层信号整合 P1 P2 P3

    虽然文章用了 research-based format 看似 neutral，但 lexical choices（fascinating、superior、crucially）、evidence selection（only positive findings）和 conclusive tone（concluded、shown）共同构成了 supportive stance。作者既在 inform readers about science，也在 implicitly advocate for running。

文中的态度信号词

  • fascinating P1

    Fascinating 是个 strong positive adjective，作者用它来 describe running 对 brain and mind 的 changes，这不是 neutral term，而是表达 admiration and interest 的 evaluative word，直接 reveal 作者认为这些 effects 是 worth attention and appreciation 的。

    同类词 remarkable intriguing impressive compelling extraordinary

  • superior P2

    Superior 是个 comparative term with positive connotation，作者用它来 describe memory performance after intense running，暗示这个 result 是 better than baseline，这种 highlighting of advantages 表明作者在 emphasize positive outcomes rather than neutrally reporting data。

    同类词 better improved enhanced stronger greater

  • crucially P3

    Crucially 是个 emphatic adverb，作者用它来 draw attention to jogging 对 emotional vulnerability 的 protective effect。这个词 signals 作者认为这个 finding 是 particularly important and meaningful，不是 casual mention，而是 deliberate emphasis，显示作者对此 result 的 positive valuation。

    同类词 importantly significantly notably remarkably particularly

  • concluded P1

    Concluded 是个 definitive verb，作者用它来 introduce research findings about runners living longer，这比用 suggested or indicated 更 assertive，表明作者 accept these findings as established facts，没有 express doubt or reservation，显示对 research validity 的 confidence and endorsement。

    同类词 demonstrated proved confirmed established showed

  • more to ... than P1

    这个 phrase structure 'there's more to running than its health benefits' 暗示 running 的 value extends beyond obvious advantages。作者用这个 structure 来 introduce additional positive aspects，creating expectation of further benefits。这种 rhetorical move 表明作者在 building a case for comprehensive advantages，不是 simply reporting isolated facts。

    同类词 beyond not only ... but also in addition to goes further than exceeds

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. 开篇陈述研究发现 P1

    说明文的 opening 是 informative 而非 argumentative 或 time-sensitive 的。本文首句 'One 60-minute run can add seven hours to your life' 是在 presenting a claim based on research，这是 explanatory opening，不是 persuasive argument 也不是 news lead。议论文会直接 state a controversial position，新闻报道会用 when/where/who 开头 report an event。

  2. 并列展示多项研究 P2 P3

    说明文的核心是 knowledge transmission through evidence，所以会 present multiple studies 来 illustrate different aspects。本文在 第2段 和 第3段 分别用了 'in one study' 和 'in another study'，这是典型的 expository pattern，目的是 explain how running affects the brain in various ways。议论文的 examples 是为了 prove a point，新闻报道聚焦 one main event 的 details。

  3. 客观陈述研究结论 P1 P2 P3

    说明文的 purpose 是 to educate，所以 tone 是 detached and informative。本文用 'research published'、'researchers compared'、'the review concluded' 等 academic reporting language，没有 persuasive verbs 也没有 urgency indicators。议论文会用 'should recognize'、'must acknowledge' 等 directive language，新闻会强调 'today'、'according to latest reports' 等 timeliness。

  4. 话题展开式结构 P1 P2 P3

    说明文的完整 architecture 是 knowledge expansion pattern：从 general topic 到 specific illustrations，目的是 deepen understanding。议论文是 persuasion pattern：从 thesis 到 supporting arguments 到 reinforced conclusion，目的是 change minds。新闻是 information delivery pattern：从 lead 到 supporting details 到 background context，目的是 inform about events。本文没有结尾的 strong conclusion 或 recommendation，也没有 who/when/where 的 event focus，符合说明文的 open-ended explanatory style。

哪些词暴露了说明文体裁？

  • research published P1 研究引用词 studies show research indicates findings suggest evidence demonstrates data reveals
  • from...to... P1 范围界定词 ranging from...to... between...and... including...and... such as...and... both...and...
  • for example P2 例证引入词 for instance such as in one study in another study to illustrate
  • in another study P3 例证承接词 in a similar study another example additionally furthermore in a different experiment
  • the effects of P1 因果关系词 the impact of the influence of result in lead to cause
  • changes P1 过程描述词 transforms alters modifies varies evolves
  • vary according to P1 条件变化词 depend on differ based on change with relate to correspond to
SENTENCE INSIGHTS · 句子精讲

5 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 2021年12月英语四级真题第2套 Part II Section C (2) 的常见问题

2021年12月英语四级真题第2套 Part II Section C (2) 文章的主旨是什么？
跑步可以延长寿命并提供显著的认知和情绪益处。研究表明,高强度短期跑步能增强学习和记忆能力,而适度慢跑有助于调节负面情绪,具体效果因跑步强度和持续时间而异。（英文表述：Running extends lifespan and provides significant cognitive and emotional benefits. Research shows that intense short-term running enhances learning and memory, while moderate jogging helps regulate negative emotions, with effects varying based on running intensity and duration.）
2021年12月英语四级真题第2套 Part II Section C (2) 文章是什么体裁？难度如何？
体裁为说明文，作者立场是积极支持（informative and positive）。CEFR 难度 B2，全文 240 词、3 段；在英语四级全部 511 篇真题文章中，B2 级共 234 篇（占 46%）。
2021年12月英语四级真题第2套 Part II Section C (2) 文章的篇章结构是怎样的？
全文 3 段按说明文骨架分为 3 个意群：第1段——引出话题并揭示跑步的多维价值；第2段——例证短时高强度跑步的认知增益；第3段——例证中等强度跑步的情绪调节作用。
2021年12月英语四级真题第2套 Part II Section C (2) 文章的作者态度是什么？
作者态度是积极支持（informative and positive）。判断路径：开篇语言客观性 → 动词确定性程度 → 情感色彩词识别 → 论据选择平衡性 → 多层信号整合；文中的态度信号词包括 fascinating（第1段）、superior（第2段）、crucially（第3段）、concluded（第1段）、more to ... than（第1段）。
2021年12月英语四级真题第2套 Part II Section C (2) 文章中有哪些值得积累的生词？
按文中出现顺序共 4 个：regulate（调节、控制）、vulnerable（易受伤害的、脆弱的）、intense（强烈的、剧烈的）、moderate（适度的、中等的），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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