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2020年12月英语六级真题第2套 Part II Section C (2)
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2020年12月英语六级真题第2套 Part II Section C (2)

说明文 · 听力 · 真题文章逐层精读

本页是 2020年12月英语六级真题第2套 Part II Section C (2) 文章的精读视角页——这篇说明文全文 385 词、6 段，CEFR 难度 B2（B2 级在英语六级文章中占 39%），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六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2020年12月英语六级真题第2套 Part II Section C (2) 的听力原文，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。

In 1984, the World Chess Championship was called off abruptly, due to the withered frame of a player who was competing for the title. He wasn't alone in experiencing the extreme physical effects of the game. Elite players can reportedly burn up to an absurd 6,000 calories in one day. Does that mean that thinking harder is a simple route to losing weight?

Well, when the body is at rest, we know that the brain uses up a startling 20% to 25% of the body's overall energy. This level of utilization actually makes the brain the most energy-expensive organ in the body, and yet it makes up only 2% of the body's weight overall.

So the more we put this organ to work, the more calories we'll burn? Technically, the answer is yes, for cognitively difficult tasks. What counts as a "difficult" mental task varies between individuals. But generally, it could be described as something that the brain cannot solve easily using previously learned routines, or tasks that change the conditions continuously.

However, deep thinking will not burn off the calories gained from eating a sugary snack. Because in relation to the brain's huge overall energy usage, which is devoted to a multitude of tasks, the energy required just to think harder is actually comparatively tiny. We're unconscious of most of what uses up the brain's energy. A lot of that activity is unrelated to conscious activities like learning how to sing or play the guitar.

The brain is able to allocate blood (and thus energy) to particular regions that are being active at that point. But the overall energy availability in the brain is thought to be constant. So, while there might be significant increases in energy use at localized regions of the brain when we perform difficult cognitive tasks, when it comes to the whole brain's energy budget overall, these activities don't significantly alter it.

So, why did the chess champion grow too skinny to compete in his chess competition? The general consensus is that it mostly comes down to stress and reduced food consumption, not mental exhaustion. Keeping your body pumped up for action for long periods of time is very energy demanding. If you can't eat as often or as much as you can or would normally—then you might lose weight.

PARAGRAPHS · 逐段精读

6 段逐段主旨与解读

逐段拆解2020年12月英语六级真题第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

    The Chess Paradox: Mental Exertion and Physical Consequences

    Introduces the paradoxical phenomenon of extreme calorie burning in chess and poses the central question of whether intensive thinking leads to weight loss.

    这个 opening paragraph 在整篇文章中扮演 'question-setting' 的角色。它通过 extreme case 建立了一个 seemingly plausible hypothesis：intensive thinking burns calories significantly。但这恰恰是文章要 debunk 的 misconception。从 article thesis 来看，这个段落是 'setup for correction'——它 deliberately presents 一个 common assumption，为后续的 scientific explanation 做好 groundwork。这种 structure 在说明文中很常见：先 acknowledge 一个 widespread belief，然后用 evidence 来 refine or correct it。

    从具体案例到核心提问
  2. P2

    The Brain's Baseline Energy Dominance

    Establishes that the brain, despite comprising only 2% of body weight, consumes 20-25% of the body's total energy at rest, making it the most metabolically expensive organ.

    这个 paragraph 在文章结构中起到 'foundational context' 的作用。它回应了第一段的 question，但方式很巧妙：并非直接 answer，而是 provides background knowledge。从 article thesis 来看，这个 baseline consumption (20-25%) 是理解 'why intense thinking doesn't burn many extra calories' 的关键。这是个 counterintuitive setup：读者可能会想 'if brain already uses so much, extra thinking must use even more'，但实际上后续段落会 reveal 恰恰相反。这种 strategic information sequencing 是说明文的典型 technique。

    数据建立参照基线
  3. P3

    The Qualified Yes: When Thinking Burns Calories

    Technically confirms that harder thinking burns more calories for cognitively difficult tasks, while defining such tasks as those requiring novel problem-solving or adapting to changing conditions.

    这个 paragraph 在文章 logical flow 中扮演 'pivot point' 角色。它表面上 affirms 第一段的 question (yes, thinking burns calories)，但通过 careful qualification 开始 shift the direction toward the eventual thesis。从 article thesis 来看，这个 'yes' 是个 strategic concession：作者 acknowledges the technical truth 以建立 credibility，然后用 narrow definition ('cognitively difficult tasks') 来 limit its scope。这为第四段的 'however' 创造了 perfect setup，因为已经 established 了只有特定类型的 thinking 才 significantly burns calories。

    肯定陈述加限定条件
  4. P4

    The Reality Check: Thinking's Negligible Caloric Impact

    Counters the previous affirmation by explaining that while difficult thinking technically burns more calories, the increase is comparatively tiny relative to the brain's massive baseline consumption, most of which powers unconscious processes.

    这个 paragraph 是文章的 argumentative climax。从 article thesis 来看，这里 delivers the core message：'intense cognitive tasks don't significantly alter overall brain energy budget'。它 strategically follows 第3段's qualified yes，用 'However' 来 pivot from theoretical possibility to practical insignificance。Structural role 非常关键：第1段 raised the question，第2段-3 seemed to support the possibility，第4段 reveals the truth。这种 'build up then deflate' structure 在说明文中很有效，因为它 mirrors readers' intuitive thinking process then corrects it with evidence。

    对比转折揭示真相
  5. P5

    The Energy Reallocation Mechanism: Local Shifts, Constant Total

    Explains the mechanism behind the previous claim: while the brain redistributes energy to active regions during cognitive tasks, the overall energy budget remains constant, so difficult thinking doesn't significantly increase total consumption.

    这个 paragraph 提供 scientific depth to 第4段's claim。从 article thesis 来看，它用 physiological mechanism ('constant overall energy budget') 来 explain why intense thinking doesn't burn significant extra calories。Structural function 是 'evidence and elaboration'：第4段 made the claim，第5段 explains the biological basis。这种 'claim then mechanism' pattern 在科学说明文中很常见。它 strengthens the argument by showing it's not just 观察，而是有 underlying biological reason。The 'localized increase' 承认 thinking 有 some effect，maintaining nuance while supporting the overall thesis。

    机制解释支撑观点
  6. P6

    The Real Culprit: Stress, Not Thinking

    Resolves the opening chess example by attributing the player's weight loss to chronic stress and reduced food intake rather than mental exertion, completing the article's debunking of the thinking-burns-calories misconception.

    这个 concluding paragraph 完成了文章的 full circle structure。从 article thesis 来看，它 delivers the final piece：elite chess players 的 weight loss 来自 'stress and reduced food intake, not mental exhaustion'。这 perfectly aligns with the thesis that 'intense cognitive tasks only marginally increase overall brain energy expenditure'。Structural role 非常重要：它 validates all the scientific explanation in 第2段-5 by applying them to the real-world case from 第1段。This creates satisfying closure：the initial puzzle has been solved，the misconception has been corrected，and readers now understand both the science (constant brain energy budget) and the reality (stress causes chess players' weight loss)。这种 'problem-explanation-resolution' structure 是说明文的 gold standard。

    回归案例给出真相
SELF CHECK · 段落自检题

6 道逐段细节自检题

针对2020年12月英语六级真题第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 6,000 calories

    What observation led to the question about whether intense thinking can help people lose weight?

    • A The championship was cancelled because the player refused to continue the match.
    • B Chess players usually lose weight by following a strict low-calorie diet.
    • C Elite chess players were reported to burn as many as 6,000 calories in a single day.
    • D A player became physically stronger after winning the world title.
    • E Most competitive games require exactly 6,000 calories every day.
    • F The player stopped competing after being diagnosed with a brain disease.
    显示答案与解析 收起答案与解析

    正确答案：C

    该项准确复现了段落中的核心 data，并与题干的 observation 和 led to 构成直接逻辑：异常高的 calories expenditure 使作者进一步提出 thinking 是否能减肥。障碍在于题干没有直接重复 6,000 calories，考生必须识别“数据现象”与“后续设问”之间的衔接。

    异常数字反向定位 时间紧张时，先扫描选项中的 6,000 calories，直接定位到 第1段；随后只回读该数字所在句及其后的设问，不必通读全文。将各选项视为 evidence 候选，正确项应保留该异常数据的主体、数值范围和报道语气。

  2. 第 2 段 定位词 energy-expensive organ body's

    Why is the brain described as the body's most energy-expensive organ?

    • A It makes up one quarter of the body's total weight.
    • B It can store more energy than all other organs combined.
    • C It becomes heavier whenever people perform difficult mental tasks.
    • D It consumes 20% to 25% of the body's energy while accounting for only about 2% of its weight.
    • E It receives a constant supply of extra energy during rest.
    • F It uses little energy because it represents only a small part of body weight.
    显示答案与解析 收起答案与解析

    正确答案：D

    该项完整保留了两组关键比例及 while 的反差关系，正是 most energy-expensive 的量化依据。设置障碍在于考生若只关注高 energy share，可能忽略 only 2% weight 所形成的“单位重量耗能高”这一论证力度。

    双比例对照栏 先用 energy-expensive organ 精确定位 第2段，再把相邻信息中的数字按“能量占比/重量占比”两栏整理。无需逐字翻译其他选项，正确项必须同时匹配两栏且保留反差关系；任何数字错配的选项立即排除。

  3. 第 3 段 定位词 cognitively difficult generally

    What generally makes a mental task cognitively difficult?

    • A It requires a person to memorize a large amount of information.
    • B It can be completed by applying familiar routines repeatedly.
    • C It always produces the same level of difficulty for every individual.
    • D It is performed only when the brain is using less energy than usual.
    • E It cannot be solved easily through previously learned routines, or its conditions keep changing.
    • F It involves learning to sing or play the guitar.
    显示答案与解析 收起答案与解析

    正确答案：E

    该项平行概括了作者给出的两个标准：不能套用 previously learned routines，以及 conditions continuously change。障碍在于原文使用 could be described as，考生要把较长的定义句压缩成两个并列条件，同时保留 or 的选择关系。

    定义句的条件切片 直接锁定 第3段 中 generally 后的定义句，把句子切成两个由 or 连接的条件块。随后采用“条件覆盖”法：正确项必须覆盖原文定义条件且不改变否定、时间或变化方向；以常识描述困难的选项不作停留。

  4. 第 4 段 定位词 sugary snack

    Why is deep thinking unlikely to offset the calories from a sugary snack?

    • A The brain stops using energy when people eat sugary foods.
    • B Deep thinking prevents the brain from carrying out unconscious activities.
    • C Sugary snacks provide no usable energy to the body.
    • D Only learning music can substantially increase the brain's energy use.
    • E Difficult mental tasks reduce the brain's overall energy consumption.
    • F The extra energy required for harder thinking is comparatively tiny relative to the brain's overall energy use.
    显示答案与解析 收起答案与解析

    正确答案：F

    该项准确呈现 Because 引导的因果解释，并保留 comparatively tiny relative to overall 的核心量级比较。因此，文章否定的不是思考会耗能，而是其额外消耗足以抵消零食热量。障碍是 extra energy 与 overall energy 的层级容易混淆。

    因为句的量级核验 用 sugary snack 定位 第4段 后，不必翻译全段，直接寻找紧随结论之后的 Because 句。再做“量纲检查”：正确项必须呈现与抵消问题相匹配的能量比较关系；只谈大脑活动或食物本身的选项都不满足该结构。

  5. 第 5 段 定位词 energy budget difficult cognitive tasks

    What happens to the brain's overall energy budget during difficult cognitive tasks?

    • A It is not significantly altered, despite increased energy use in localized active regions.
    • B It rises substantially because every brain region becomes active.
    • C It falls when blood is allocated to active regions.
    • D It becomes unlimited whenever a task changes continuously.
    • E It is determined mainly by how much food a person has consumed.
    • F It is used only by regions involved in conscious learning.
    显示答案与解析 收起答案与解析

    正确答案：A

    该项完整对应段落末句的让步逻辑：localized regions may show significant increases，but whole brain's energy budget does not significantly alter。障碍是 significant 在原文修饰局部 increase，而 not significantly 修饰整体 alter；考生必须正确匹配修饰范围。

    局部与总盘分栏 扫描 energy budget，直达 第5段 的最后一句，然后从该句提取总体结论。采用“尺度筛选”而非逐项精读：凡选项把 localized region 的变化直接写成 whole brain 的变化，立即淘汰；正确项必须同时保持局部与整体的范围边界。

  6. 第 6 段 定位词 chess champion

    What is the most widely accepted explanation for the chess champion's weight loss?

    • A Mental exhaustion caused by solving difficult chess problems.
    • B Prolonged stress and reduced food consumption, rather than mental exhaustion.
    • C A permanent increase in the brain's overall energy availability.
    • D The player's deliberate decision to avoid all sugary snacks.
    • E The brain's inability to send blood to active regions during a match.
    • F The unusually large amount of food he consumed before competing.
    显示答案与解析 收起答案与解析

    正确答案：B

    该项精确保留 general consensus 的主要归因，以及 rather than 所排除的 mental exhaustion。随后关于 body pumped up for action 与不能正常进食的句子，为 stress 和 reduced food consumption 提供因果支持。障碍在于文章前文大量讨论 brain energy，极易诱使考生误选 mental exhaustion。

    共识句的因果权重 先用 chess champion 定位 第6段，再扫描表示共识、主要归因和排除关系的句子。采用“因果权重”判断：正确项必须符合作者确认的主因及其排除关系；仅复述前文能耗讨论的选项，即使措辞专业，也不能作为最终解释。

STRUCTURE · 篇章结构

6 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：下棋消耗极高卡路里

    通过 1984 年 World Chess Championship 被迫中断的 dramatic case，引出 elite chess players 每天可能 burn up to 6,000 calories 这个 startling phenomenon，并用 rhetorical question 提出核心疑问：thinking harder 是否能成为 losing weight 的 simple route？这是典型的说明文 hook opening，用 extreme example 吸引 readers' attention。

    作为说明文的 opening paragraph，它建立了整篇文章的 central question：mental activity 和 energy consumption 之间的关系。通过 chess player 的 extreme case 制造 cognitive dissonance，让 readers 产生好奇心，为后续的 scientific explanation 做铺垫。

    提出待解释现象
  2. P2

    科学背景：大脑的基础能量消耗

    提供 fundamental scientific background：brain 在 resting state 时就 consume 人体总能量的 20% to 25%，虽然只占 body weight 的 2%，却是 the most energy-expensive organ。这个 baseline information 是理解后续 argument 的必要 foundation，属于说明文中的 background information section。

    在说明文的 logical structure 中，这是 establishing the baseline 的关键步骤。它提供了 quantitative evidence 来说明 brain 本身就是 high energy consumer，为后续解释 why additional thinking doesn't significantly increase calorie burn 提供 comparative reference point。这种 baseline-then-variation 是科学说明文的 standard pattern。

    提供基础数据
  3. P3

    初步回答：困难思考确实增加能量消耗

    直接 address 第1段 提出的 question：more cognitive work 理论上会 burn more calories，但限定条件是 cognitively difficult tasks。进一步 define 什么是 difficult mental task—— cannot be solved using learned routines 或 continuously changing conditions。这是说明文中的 direct answer with qualification，既回答了 question 又引入了 nuance。

    在说明文的 argumentative structure 中，这是 thesis statement with qualification。它看似支持 initial hypothesis（thinking burns calories），但通过 "technically" 和 specific conditions 的 introduction，为后续的 major rebuttal (第4段) 埋下伏笔。这种 yes-but structure 是科学说明文处理 complex questions 的典型方式。

    给出限定性肯定答案
  4. P4

    核心论点：思考增加的能量消耗微不足道

    用强转折 "However" 引出 central argument：deep thinking 并不能 burn off meaningful calories，因为 additional energy for harder thinking 相对于 brain's huge overall energy usage 来说是 comparatively tiny。强调大部分 brain energy 用于 unconscious activities，和 conscious learning 无关。这是整篇说明文的 core thesis，directly challenge 了 initial assumption。

    这是说明文的 central argument paragraph，直接支撑 main thesis。它通过 quantitative comparison ("comparatively tiny" vs. "huge overall energy usage") 和 causality explanation 来 debunk the myth。这个 sense group 将前面的 background information 整合起来，用 logical reasoning 得出 counterintuitive conclusion，是全文的 argumentative climax。

    揭示核心机制
  5. P5

    机制解释：局部能量增加但总量恒定

    提供 physiological mechanism 来 support 第4段 的 claim：brain 能够 allocate blood (and energy) 到 active regions，但 overall energy budget 保持 constant。虽然 difficult cognitive tasks 会导致 localized regions 出现 significant energy increase，但 whole brain 的 total energy expenditure 并没有 significantly alter。这是用 biological mechanism 来 justify 前文的 conclusion。

    在说明文的 explanatory structure 中，这是 mechanism explanation layer。它通过 introduce the concept of energy redistribution vs. total energy constancy 来 provide scientific grounding for the main claim。这种 claim-then-mechanism pattern 是科学说明文建立 credibility 的标准方式，将 observation 和 underlying biological reality 连接起来。

    提供科学机制
  6. P6

    回归案例：解释棋手消瘦的真实原因

    用 conclusive question "So, why did the chess champion grow too skinny" 形成 circular structure，回到 第1段 的 case。基于前面的 scientific explanation 给出 answer：主要是 stress and reduced food consumption，而非 mental exhaustion。解释 prolonged stress 的 energy demand，以及 reduced eating 导致 weight loss。这是说明文的 application/conclusion section，将 theory 应用到 initial problem。

    在说明文的 structural design 中，这是 closing the loop。它通过 revisit the opening case 并用 established scientific principles 来 provide definitive answer，给读者 sense of closure。这种 problem-explanation-application 的 circular structure 是说明文 maintain coherence 和 reader engagement 的有效手段，也强化了 main thesis 的 practical relevance。

    解答开篇疑问
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2020年12月英语六级真题第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六级文章。

  1. 开篇现象+疑问 P1

    说明文的 first paragraph 开篇段通常会 present 呈现一个 surprising fact 令人惊讶的事实或 phenomenon 现象来 hook 吸引读者,同时 raise a question 提出疑问。这个 initial question 最初的问题往往就是全文要 address 解答的 central issue 核心议题

  2. 转折词后的限定 P4 P5

    说明文在 explaining 解释过程中常用 contrast 对比来 clarify 澄清概念。当出现 however, but, yet 等 turning words 转折词时,这些 signals 信号标志着作者在 refining 细化或 limiting 限制前文的 claim 论断,这种 qualification 限定往往就是 thesis 主旨的 核心 core

  3. 结尾因果解释 P6

    说明文的 conclusion 结尾通常会 provide 提供 definitive answer 明确答案,特别是用 causal language 因果语言(比如 comes down to, results from)来 explain 解释 the actual mechanism 实际机制。这个 final explanation 最终解释就是对 opening question 开篇问题的 direct answer 直接回答,也是 thesis 主旨的 conclusive statement 总结性陈述

  4. 三段核心整合 P1 P4 P5 P6

    说明文的 thesis 主旨是 multi-layered 多层次的,需要 integrate 整合全文的 key information points 关键信息点。开篇的 phenomenon 现象+中间的 limitation 限制+结尾的 real cause 真实原因,这三者 combined 结合起来构成 full picture 全貌

主旨信号词 However P4 actually P4 comes down to P6 overall P5 not... but P6

MAIN IDEA · 主旨

这篇文章在说什么

虽然大脑在静息状态下消耗大量能量(占身体总能量的20-25%),但像下棋这样的高强度认知任务只会略微增加大脑的整体能量消耗。顶级棋手的体重下降主要源于压力和食物摄入减少,而非脑力消耗本身。
While the brain consumes significant energy at rest (20-25% of body's total), intense cognitive tasks like chess only marginally increase overall brain energy expenditure. Weight loss in elite chess players results primarily from stress and reduced food intake, not mental exertion itself.
WORD INFERENCE · 生词推断

5 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。已收录进英语六级高频真题词集的单词可点击进入词条页。

  • withered 枯瘦的、憔悴的

    让我们把这些 clues 串联起来。首先,withered frame 导致了 championship 的 abrupt cancellation,说明这是一个 severe condition。然后,文章在 第6段 揭示这位 player 变得 too skinny,这个 detail 与 opening description 形成 perfect alignment。最后,从 morphology 角度,wither 的 botanical meaning 转移到 human context,强化了 physical shrinkage 的意象。所有这些 evidence 共同指向一个 conclusion:withered 描述的是因为 extreme weight loss 导致的身体 emaciated、shrunken 的状态。

    三角验证法:因果-呼应-词根
  • absurd 荒谬的、不合理的

    现在让我们 synthesize 这些 observations。首先,absurd 被放置在一个 extremely high number 前面作为 modifier。其次,这个数字与 common sense 关于 daily calorie consumption 的认知形成 stark contrast。第三,作者随后用 skeptical questioning 来 challenge 这个 implication。这三个 layers 共同构建了一个 semantic field:absurd 表达的是某种 beyond reasonable 或 hardly believable 的程度,带有 ridiculous 的意味。

    态度分析法:对象-常识-语气
  • startling 令人惊讶的、惊人的

    让我们 connect 这些 dots。作者用 special rhetorical framing 来 present 大脑的 energy usage,然后用 startling 来 label 这个 statistic。随后的 extreme disproportion between size 和 energy consumption 提供了 concrete evidence,说明为什么这个 fact 值得用 startling 来描述。从 word structure 看,start + -ling 本身就携带 'causing sudden reaction' 的意味。综合起来,startling 描述的是某种 unexpected、surprising 的特质,能让人产生 sudden realization。

    反应词解析法:铺垫-证据-词根
  • allocate 分配、分派

    让我们 integrate 这些 insights。Sentence structure 显示 allocate 是一个 transitive action,涉及将 resources 移动到 specific locations。Context 表明这个 movement 不是 random 的,而是基于 regions 的 activity level 来决定。Furthermore,subsequent explanation 澄清了 allocate 发生在 constant total 的前提下,意味着它描述的是 reallocation 或 redistribution。所以 allocate 的 core meaning 是:有目的地将 limited resources 分配或指派到 different parts。

    行为图式法:角色-限制-逻辑
  • consensus 共识、一致意见

    现在让我们 synthesize。首先,discourse function 显示 consensus 用来 introduce authoritative explanation,带有 'widely accepted' 的含义。其次,grammatical pattern 'general consensus is that' 是 academic register 中 presenting established views 的 standard formula。最后,morphological analysis 揭示 con-(together) + sens-(think) 的组合,直接对应 'shared thinking'。All evidence converges:consensus 指的是 group members 之间达成的 common agreement 或 shared opinion。

    概念词剖析法:功能-搭配-词源
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。

  • 列数字

    P1 P2

    文章中频繁使用 precise numerical data 来建立论证的可信度。比如开头提到 elite chess players 每天能消耗 an absurd 6,000 calories，这个惊人的数字 immediately grabs attention 并引出核心问题。接着用 20% to 25% 说明大脑在 at rest 时的能量占比，用 2% 对比大脑重量，这种 quantitative contrast 强化了大脑是 energy-expensive organ 的观点。这些 specific figures 不是随意堆砌，而是为主旨服务：通过数据对比让读者理解，虽然大脑 consumes significant energy，但 intense thinking 本身并不会 significantly increase 整体能耗，从而支撑 'mental exertion doesn't cause weight loss' 这一核心论点。

    信号词 6,000 calories 20% to 25% 2% up to approximately nearly over about around roughly as much as as high as

    仿写： 当你想 establish a fact 或 emphasize contrast 时，问自己：这个观点能否用 specific data 来支撑？比如不说 'many people'，而是说 '67% of respondents'；不说 'significant increase'，而是说 'a 300% surge'。注意数字要 serve the purpose：如果想强调差异，用 percentage 或 ratio；如果想建立 scale，用 absolute numbers。仿写模版：【主题】accounts for/consumes/reaches【具体数字+单位】, which is【对比数字】times more/less than【对比对象】, making it【结论性描述】。例如：The manufacturing sector accounts for 28% of total emissions, which is 3 times more than the transportation sector, making it the primary target for reduction policies.

  • 作比较

    P2 P4 P5 P6

    文章巧妙地使用 comparative structures 来揭示 paradoxical relationship。第2段 中 'the brain uses 20-25% of energy but makes up only 2% of body weight' 这个 stark contrast 凸显大脑的 disproportionate energy consumption。第4段 中 'the energy required to think harder is comparatively tiny in relation to the brain's huge overall energy usage'，这个对比直接服务于主旨：虽然 deep thinking 确实 uses more energy，但相对于 baseline consumption 来说 negligible。这种 internal comparison within the same organ 比单纯说 'thinking uses little energy' 更有说服力，因为它建立了 relative scale。作者还在 第6段 对比了 perceived cause (mental exhaustion) 和 actual cause (stress, reduced food intake)，这个 causal comparison 是全文论证的 culmination。

    信号词 but in relation to comparatively while whereas in contrast to compared to unlike however on the other hand conversely rather than as opposed to

    仿写： 构建比较时，先确定 comparison basis：你在比什么？是 magnitude，是 nature，还是 effectiveness？然后选择 comparative markers：'while X..., Y...', 'in contrast to X, Y...', 'X is... whereas Y is...'。注意 parallel structure 能增强 readability。仿写模版：While【对象A】【特征A描述】, 【对象B】【对比性特征B描述】, making/showing/highlighting【对比结论】。例如：While renewable energy projects require substantial initial investment, fossil fuel infrastructures demand continuous fuel costs, making renewables more cost-effective in the long run. 或用 'in relation to' 结构：【较小量】is comparatively【形容词】in relation to【较大量】。

  • 举例子

    P1 P4 P6

    文章开篇就用 1984 World Chess Championship 的 real-world incident 作为 concrete example 来引入话题。这个 anecdote about a withered chess player 不是 decorative detail，而是 serves as evidence for the phenomenon：mental activity 似乎能产生 extreme physical effects。在 第3段 中，'learning how to sing or play the guitar' 这些 everyday examples 帮助读者理解什么是 conscious cognitive activities。第6段 回到 chess champion 这个例子，用它来 demonstrate the real cause (stress and reduced food intake) versus the perceived cause (mental exhaustion)。这种 bookend structure 让例子不只是 introduction，更是 argument validation。通过 specific, relatable examples，抽象的 brain energy consumption 概念变得 tangible。

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

    仿写： 选择例子时要问：这个 instance 能否 clearly demonstrate 我的观点？它是否 accessible to my audience？使用 introductory phrases 来 signal examples：'for instance', 'such as', 'take... as an example'。注意例子的 level of detail：太简略会 lack impact，太冗长会 distract from main point。仿写模版：【观点陈述】. For instance/Take【具体例子主体】as an example: 【例子的具体细节和过程】, which【例子如何支持观点】。例如：Intermittent fasting can significantly affect metabolism. Take the 16:8 method as an example: practitioners fast for 16 hours daily and eat within an 8-hour window, which allows insulin levels to drop sufficiently for fat-burning to occur.

  • 作诠释

    P3 P4 P5

    文章多次使用 explanatory elaboration 来 clarify complex concepts。第3段 开头问 'So the more we put this organ to work, the more calories we'll burn?'，然后 immediately answer and qualify：'Technically, yes, for cognitively difficult tasks.' 接着进一步 elaborate 什么是 'difficult mental task'，用 'something the brain cannot solve easily using previously learned routines' 来 unpack 这个概念。第5段 中 'The brain is able to allocate blood (and thus energy)' 这个 parenthetical clarification 解释了为什么 blood flow matters。这些 interpretive statements 不是简单重复，而是 provide additional layers of meaning，帮助读者 grasp nuances。特别是 第4段 和 第5段 中对 'why deep thinking doesn't burn many calories' 的 layered explanation，它通过 'unconscious activities', 'localized vs. overall energy budget' 等角度 progressively deepen understanding，这正是作诠释的精髓。

    信号词 and thus that is in other words which means to put it simply essentially namely i.e. or rather to clarify more specifically

    仿写： 当你使用 technical terms 或 abstract concepts 时，问自己：读者可能在哪里 get confused？用 clarifying phrases 来 introduce interpretations：'in other words', 'that is', 'which means', 'to put it simply'。Parenthetical explanations (用括号) 也是 powerful tool for quick clarification without disrupting flow。仿写模版：【初始陈述/概念】. In other words/That is to say, 【用更简单或不同角度的语言重新表述】, which【进一步说明其含义或影响】。例如：Neural plasticity allows the brain to reorganize itself. In other words, neural connections can be strengthened or weakened based on experience, which means learning literally changes brain structure. 或用括号：The hippocampus (the brain region responsible for memory formation) shows remarkable plasticity.

  • 下定义

    P3

    第3段 中作者对 'cognitively difficult tasks' 进行了 explicit definition：'something that the brain cannot solve easily using previously learned routines, or tasks that change the conditions continuously.' 这个定义 precisely demarcates 什么样的 mental activities 才会 increase energy consumption。这个 definitional move 对主旨至关重要，因为它 clarifies the scope：不是所有 thinking 都 burns calories，只有 novel, challenging tasks 才会。这个定义还用 'or' 连接两个 complementary criteria，使定义更 comprehensive。通过这个定义，作者 establishes clear boundaries，避免读者 misinterpret 'thinking burns calories' as applying to all mental activities。

    信号词 What counts as is defined as refers to means is represents can be described as is understood as constitutes is characterized by

    仿写： 构建定义时，先确定你在定义 what kind of thing (category)，然后说明 its unique characteristics (differentiation)。使用明确的 definitional phrases：'X is defined as', 'X refers to', 'X means', 'What we mean by X is'。避免 circular definitions（用 term 本身来定义自己）。如果概念 complex，可以用 multiple criteria 或 examples 来 supplement。仿写模版：【术语】is defined as/refers to【所属类别】that/which【区别性特征1】and/or【区别性特征2】。例如：Sustainable development is defined as development that meets present needs without compromising the ability of future generations to meet their own needs. 或：What counts as 'active learning' varies, but generally it refers to instructional methods that engage students in the learning process through discussion, problem-solving, or hands-on activities.

  • 分类别

    P4 P5

    虽然不像典型的 categorical exposition，文章在 第4段 中进行了 implicit categorization：区分 'conscious activities' (like learning to sing or play guitar) 和 'unconscious activities' that use up brain energy。这个 binary classification 服务于论证：大脑的大部分能耗 devoted to unconscious processes，所以 conscious thinking 的额外能耗 relatively minor。第5段 也体现了分类思维：'localized regions' 的能耗增加 vs. 'whole brain's energy budget'，这种 part-whole categorization 解释了为什么 regional activation 不会 significantly alter overall consumption。这些分类不是 exhaustive taxonomy，而是 strategic distinction 来支持论点。

    信号词 can be divided into falls into types of categories of kinds of classified as some... others one type... another type includes consists of

    仿写： 进行分类时，先确定 classification basis：你根据什么标准分类？是功能、性质、来源，还是程度？然后使用 categorical language：'can be divided into', 'falls into X categories', 'there are X types of'。如果是 binary distinction，用 'while... the other', 'some... others', 'on one hand... on the other hand'。仿写模版：【主题】can be divided into/falls into【数量】categories/types: 【类别1】, which【特征1】, and【类别2】, which【特征2】。例如：Learning strategies can be divided into two broad categories: surface strategies, which involve rote memorization and repetition, and deep strategies, which involve connecting new information to existing knowledge. 或用 implicit distinction：While【类别A】【特征A】, 【类别B】【对比特征B】.

IMPLIED MEANING · 言外之意

5 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。

  • chess consumption极端性的质疑暗示

    P1
    Elite players can reportedly burn up to an absurd 6,000 calories in one day.

    情态词 absurd ridiculous implausible questionable dubious supposedly allegedly

    作者用 absurd 这个词 deliberately cast doubt on 这个 6,000 calories 的 claim。表面上是在 present 一个 extreme physical effect,但 implicitly 是在 set up a misconception 需要被 debunk。这个 implication serves 文章主旨,因为整篇文章就是要 argue thinking harder doesn't actually burn significant calories。第一段的这个 seemingly dramatic claim 其实是个 hook,用来 引出后面的 scientific explanation 证明 mental work 的 calorie burn 其实 negligible。这种 rhetorical strategy 通过 present an exaggerated belief 然后 systematically dismantle it 来 strengthen the main argument。

  • 简单思考不等于高消耗的逻辑转折

    P3
    Technically, the answer is yes, for cognitively difficult tasks.

    委婉表达 Technically technically strictly speaking in theory theoretically formally literally

    Technically yes 这个表达 superficially confirms 思考更多会 burn more calories,但 implicitly 是在说 'yes, but it's more complicated'。这个 implication 对文章主旨至关重要,因为作者需要 acknowledge the kernel of truth (脑力活动确实 consume energy) 同时 set up the rebuttal (但 practically insignificant for weight loss)。这种 nuanced acknowledgment prevents the argument from being dismissed as oversimplified,而是 build credibility before delivering the main point in 第4段 that 'deep thinking will not burn off calories from a snack'。这是 classic rhetorical move in scientific writing: concede the technical point 来 better emphasize the practical limitation。

  • 深度思考减肥效果的直接否定

    P4
    However, deep thinking will not burn off the calories gained from eating a sugary snack.

    转折类 However however but yet nevertheless nonetheless still

    However 在这里 explicitly contradict 前面 paragraph 的 technically yes,明确 deliver the core message: mental effort 对于 weight loss 是 ineffective。这个 implication directly serve 文章主旨,因为它 cut through the misconception 用 blunt, practical terms。作者 strategically place 这个 however statement at paragraph opening 来 ensure maximum impact。The implicit message 是:不管理论上 brain energy consumption 如何,在 practical terms of weight management,thinking harder 完全 irrelevant。这种 direct contradiction of a popularly held belief (脑力劳动减肥) 是整篇文章的 argumentative climax,后面的 paragraphs 都在 provide scientific explanation 来 support 这个 central claim。

  • 局部增加不改变整体的对比限制

    P5
    So, while there might be significant increases in energy use at localized regions of the brain when we perform difficult cognitive tasks, when it comes to the whole brain's energy budget overall, these activities don't significantly alter it.

    让步类 while although though even though even if despite in spite of

    While 引导的让步结构在这里 serve a critical explanatory function: 它 acknowledge 局部脑区确实 show energy spikes (这 validate 前面的 'technically yes'),但 immediately contextualize 这个现象 within the bigger picture of overall brain energy budget。The implication 是:不要被 localized changes 误导,真正 relevant 的是 total energy expenditure,而这个 remains constant。这 directly support 文章主旨 by providing the physiological mechanism behind why thinking harder doesn't burn meaningful calories。作者 use this concessive structure 来 preempt potential objections ('但是难题时局部脑区明明能量增加啊'),同时 reinforce the central argument through scientific evidence。这种 rhetorical strategy make the argument 更 sophisticated and harder to refute。

  • chess选手体重流失的真相揭示

    P6
    The general consensus is that it mostly comes down to stress and reduced food consumption, not mental exhaustion.

    模糊限制语 mostly mainly largely primarily predominantly chiefly principally

    Mostly 这里的 implication 是 definitively attribute weight loss to stress and reduced eating,而 explicitly rule out mental exhaustion as the cause。这 directly circle back to 文章开头的 chess championship example,形成 narrative closure。The implicit message 是:the dramatic physical effects mentioned in 第1段 were real,但 cause 完全不是 people think (mental energy burn) 而是 much more mundane (stress-induced appetite loss)。这个 revelation 完美 support 文章主旨:即使是 extreme cognitive tasks like championship chess 也 don't burn significant calories through thinking itself。作者 strategically save this explanation for the conclusion 来 provide satisfying answer to the opening anecdote,同时 reinforce the core argument with real-world example。

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（ Objective and explanatory with mild debunking intent）。下面是按步骤还原的判断过程与文中的态度信号词。

  1. 戏剧性例子引出疑问 P1

    说明文的 opening strategy 往往会 reveal 作者的 purpose。如果作者用 surprising anecdote 然后紧跟 question，通常意味着他要 clarify 或者 debunk 某个 common belief，这表明作者会保持 objective stance 去 explain facts。

  2. 密集的科学数据陈述 P2 P3

    说明文作者如果保持 neutral attitude，会大量使用 declarative sentences 配合 scientific data（如'20% to 25%'、'2% of body's weight'）。缺少 emotional adjectives 或者 subjective judgments 表明作者在 maintain objectivity，重点是 inform 而非 persuade。

  3. 基于证据的否定纠正 P4 P5

    说明文中的 contrastive markers（However、But）后面通常跟随作者要 emphasize 的 main point。当作者用 negation（'will not'）来 refute 某个 popular belief 时，这不是 personal criticism，而是 fact-based correction。这种 corrective function 仍然属于 neutral explanation 的范畴，因为它是 based on evidence，不是 emotional judgment。

  4. 科学共识解答疑问 P6

    说明文的 concluding strategy 会 reveal 作者的 ultimate stance。这里作者选择 cite scientific consensus 而非 personal opinion 来 resolve 开篇的 mystery，表明整篇文章的 purpose 是 clarify scientific facts，态度自始至终保持 neutral and educational。没有 passionate call to action 或者 strong judgments，只有 calm explanation。

  5. 全文客观教育基调 P1 P2 P3 P4 P5 P6

    说明文作者态度的综合判断需要 integrate multiple signals：person perspective、organizational logic、proportion of facts vs. opinions、presence of corrective intent。这篇文章虽然 debunks 一个 myth（思考更多能显著减肥），但 debunking 的方式是 gentle and educational，没有 mockery 或 harsh criticism，因此整体态度是 objective neutral with explanatory purpose。

文中的态度信号词

  • reportedly P1

    'Reportedly'这个 hedging word 表明作者在 cite information 时保持 cautious stance，不是直接 assert 而是 attribute to sources。这种 distancing language 显示作者的 objective approach，他在 present claims 的同时 acknowledge 信息来源的不确定性。

    同类词 allegedly apparently supposedly it is said that according to reports

  • we know that P2

    'We know that'是 established fact marker，作者用它来 introduce widely accepted scientific knowledge（大脑消耗20-25%能量）。这个 phrase 不是'I believe'或'some people think'，而是 signal consensus knowledge，表明作者在 present objective facts 而非 personal opinions。

    同类词 it is known that research shows studies indicate evidence suggests it has been established

  • However P4

    'However'是个 critical turning point，标志着作者开始 introduce contrasting information。在说明文中，这个 adversative conjunction 不是用来 express disagreement，而是用来 present a more complete picture。作者用它来 qualify 前面提到的'yes, thinking burns calories'，补充说明 the effect is minimal。

    同类词 however but yet nevertheless on the other hand

  • comparatively tiny P4

    'Comparatively tiny'是个 qualifying phrase，作者用它来 put things in perspective。这不是 emotional judgment（如'disappointingly small'）而是 factual comparison。'Comparatively'这个 adverb 表明作者在 make precise distinctions，maintain scientific accuracy。

    同类词 relatively small insignificant compared to negligible in relation to minimal impact modest effect

  • thought to be P5

    'Thought to be'是另一个 hedging expression，显示作者 acknowledge scientific understanding 的 current state 和 potential limitations。作者没有说'is constant'而是说'is thought to be constant'，这体现了 intellectual honesty 和 cautious approach，是 objective scientific writing 的标志。

    同类词 believed to be considered to be assumed to be appears to be seems to be

  • general consensus P6

    'General consensus'表明作者 rely on collective scientific judgment 而非 personal opinion 来 answer 开篇的 question。这个 phrase 把 explanation 的 authority 归于 scientific community，显示作者 position 是 neutral reporter of scientific knowledge 而非 opinionated commentator。

    同类词 scientific consensus experts agree widely accepted commonly understood prevailing view

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六级 真题文章。

如何快速判断这是一篇说明文？

  1. 开头提出待解释现象 P1

    本文 第1段 提出了 chess players burning calories 这个 intriguing phenomenon，并以 question 形式引出话题：'Does that mean that thinking harder is a simple route to losing weight?'。这是典型的说明文 opening pattern，focus on explaining a phenomenon，而非议论文的 stating a position 或新闻报道的 reporting an event。

  2. 层层递进阐释机制 P2 P3 P4 P5

    第2段 到 第5段 形成明显的 explanatory chain：先 establish baseline facts（大脑 energy consumption），然后 address the question raised（thinking harder 能否 burn more calories），接着 provide nuanced explanation（局部 vs 整体 energy use），最后 qualify the answer（overall impact 很小）。这是 explaining 而非 arguing，每段都在 build understanding，而不是 build an argument。

  3. 客观中立的陈述语气 P2 P3 P4 P5 P6

    全文使用 neutral、informative language：'the brain uses up'、'technically, the answer is yes'、'the general consensus is'。没有 persuasive markers（应该、必须）或 news reporting markers（据报道、昨日发生）。Tone 始终是 explaining facts and mechanisms，而非 convincing readers 或 reporting news。

  4. 解答开篇疑问 P6

    第6段 回到开头的 chess champion example，用 scientific explanation（stress and reduced food consumption）来 resolve the initial puzzle。这是 typical explanatory closure：用理性分析 answer the opening question，而不是 urge action 或 wrap up news story。

  5. 现象解释的完整循环 P1 P2 P3 P4 P5 P6

    本文完美体现说明文 DNA：开篇 pose intriguing question，中间 层层 explain mechanisms，结尾 provide satisfying answer。整体 purpose 是让读者 understand 'why chess players lose weight' 和 'how brain energy works'，而不是 convince them of a viewpoint 或 inform them of current events。

哪些词暴露了说明文体裁？

  • can burn up to P1 事物属性功能描述词 uses up makes up is devoted to is thought to be comes down to
  • we know that P2 说明对象定义解释词 this means that could be described as what counts as generally, it could be the answer is
  • So P3 说明顺序与例证词 However Because But when it comes to while
  • Technically, the answer is yes P3 说明对象定义解释词 Technically, the answer is generally, it could be described as What counts as the general consensus is is thought to be
  • Because P4 说明顺序与例证词 due to So comes down to is devoted to in relation to
  • is able to P5 事物属性功能描述词 is capable of functions to serves to enables allows
  • when we perform difficult cognitive tasks P5 说明顺序与例证词 when we perform when it comes to for example such as like
  • The general consensus is that P6 说明对象定义解释词 The general consensus is It is widely accepted that Research suggests that Studies indicate that The prevailing view is
SENTENCE INSIGHTS · 句子精讲

13 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 2020年12月英语六级真题第2套 Part II Section C (2) 的常见问题

2020年12月英语六级真题第2套 Part II Section C (2) 文章的主旨是什么？
虽然大脑在静息状态下消耗大量能量(占身体总能量的20-25%),但像下棋这样的高强度认知任务只会略微增加大脑的整体能量消耗。顶级棋手的体重下降主要源于压力和食物摄入减少,而非脑力消耗本身。（英文表述：While the brain consumes significant energy at rest (20-25% of body's total), intense cognitive tasks like chess only marginally increase overall brain energy expenditure. Weight loss in elite chess players results primarily from stress and reduced food intake, not mental exertion itself.）
2020年12月英语六级真题第2套 Part II Section C (2) 文章是什么体裁？难度如何？
体裁为说明文，作者立场是客观中立（Objective and explanatory with mild debunking intent）。CEFR 难度 B2，全文 385 词、6 段；在英语六级全部 593 篇真题文章中，B2 级共 233 篇（占 39%）。
2020年12月英语六级真题第2套 Part II Section C (2) 文章的篇章结构是怎样的？
全文 6 段按说明文骨架分为 6 个意群：第1段——引出问题：下棋消耗极高卡路里；第2段——科学背景：大脑的基础能量消耗；第3段——初步回答：困难思考确实增加能量消耗；第4段——核心论点：思考增加的能量消耗微不足道；第5段——机制解释：局部能量增加但总量恒定；第6段——回归案例：解释棋手消瘦的真实原因。
2020年12月英语六级真题第2套 Part II Section C (2) 文章的作者态度是什么？
作者态度是客观中立（Objective and explanatory with mild debunking intent）。判断路径：戏剧性例子引出疑问 → 密集的科学数据陈述 → 基于证据的否定纠正 → 科学共识解答疑问 → 全文客观教育基调；文中的态度信号词包括 reportedly（第1段）、we know that（第2段）、However（第4段）、comparatively tiny（第4段）、thought to be（第5段）、general consensus（第6段）。
2020年12月英语六级真题第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 5 个：withered（枯瘦的、憔悴的）、absurd（荒谬的、不合理的）、startling（令人惊讶的、惊人的）、allocate（分配、分派）、consensus（共识、一致意见），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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