懒笔记
2021年12月英语四级真题第3套 Part III Section A Can you 'turn off’ a nightmare?
CET-4 · 来自 2021年12月英语四级真题第3套 · Part III Section A · 完形填空（选词填空）

Can you 'turn off’ a nightmare?

《你能“关掉”噩梦吗?》 —— 2021年12月英语四级真题第3套文章逐层精读

本文选自 2020年2月16日刊登在 www.livescience.com(生活科学网站)上的一篇标题为“Can you 'turn off’ a nightmare?”(《你能“关掉”噩梦吗?》)的文章。

本页是 2021年12月英语四级真题第3套 Part III Section A 文章的精读视角页——这篇说明文全文 245 词、6 段，CEFR 难度 B2（B2 级在英语四级文章中占 46%），作者立场为「客观中立」；英文原文之外，本篇已有的 11 项精读维度逐项展开，其中能迁移到其他英语四级真题文章的判断方法（篇章结构、修辞、言外之意、作者态度、体裁速判）随各维度一并讲透。

精读最佳实践

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

PASSAGE · 文章原文

6 段英文原文

以下为2021年12月英语四级真题第3套 Part III Section A 的完形填空（选词填空）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。

Can you 'turn off’ a nightmare?

The sheets are damp with sweat. You're cold, but your heart is racing as if a killer just chased you down a dark street. It was just a nightmare, you tell yourself; there's nothing to be afraid of. But you're still filled with fear.

Given how unsettling and haunting nightmares can be, is there a way for dreamers to avoid, or even turn off, these bad dreams as they happen?

Research is limited, but some studies suggest that people who can master lucid dreaming—that is, the ability to be aware that a nightmare is happening and possibly even control it without waking up—may hold the answer.

Nightmares are part of the human experience, especially for kids. Doctors typically don't consider occasional nightmares a problem. They can just be symptoms of a sleep disorder that can result from an unpleasant experience, stress, or certain drugs.

To treat the disorder, there are a number of medicines and therapies that are backed by rigorous research, according to the American Academy of Sleep Medicine, which analyzed the available research on the treatment of nightmare disorder in a recent review published in the Journal of Clinical Sleep Medicine.

However, nightmares are complicated, and researchers are still struggling to understand them, said Dr. Rachel Salas, an expert on sleep disorders and an associate professor at Johns Hopkins Medicine in Baltimore. What we do know is that people tend to have different kinds of nightmares at different points during the sleep cycle.

PARAGRAPHS · 逐段精读

6 段逐段主旨与解读

逐段拆解2021年12月英语四级真题第3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 Lasting Fear of Nightmares

    Nightmares can leave people intensely frightened after they wake up.

    本段以强烈的 personal experience 吸引读者，并证明噩梦并非无关紧要的小事。它为全文的核心问题——人能否 avoid 或 control 这些 bad dreams——提供了现实动因。

    抓住噩梦醒后的恐惧
  2. P2

    Can Nightmares Be Controlled?

    The article raises the question of whether people can prevent or stop nightmares.

    本段是文章从现象描述转入 scientific inquiry 的枢纽。它把第一段的恐惧感具体化为“如何避免或停止噩梦”的问题，并为第三段引入 lucid dreaming 铺路。

    锁定控制噩梦的设问
  3. P3

    Lucid Dreaming as a Possible Solution

    Limited research suggests that lucid dreaming may allow people to control nightmares.

    本段首次回应了全文的核心设问，提供 lucid dreaming 这一潜在答案。与此同时，它强调 research is limited，使文章保持客观基调，并为后文转向更成熟的医学治疗方案形成对照。

    抓住清醒梦的可能作用
  4. P4

    When Nightmares May Signal a Problem

    Nightmares are common and usually harmless, but they can sometimes signal a sleep disorder.

    本段为全文提供 medical background，说明为什么不能简单把所有噩梦都视为疾病。它也引出 nightmare disorder 这一更需要干预的对象，为第五段讨论 treatment 奠定了逻辑基础。

    区分偶发噩梦与障碍信号
  5. P5

    Evidence-Based Treatments for Nightmare Disorder

    Research-backed medicines and therapies are available for nightmare disorder.

    本段将文章从“清醒梦这种潜在办法”推进到经过 rigorous research 支持的正式治疗。它丰富了全文关于应对噩梦的论述，但 treatment 的对象明确是 nightmare disorder，而非所有偶发噩梦。

    提炼治疗结论与证据
  6. P6

    The Continuing Mystery of Nightmares

    Nightmares are still poorly understood, although they vary across the sleep cycle.

    本段以科学上的 uncertainty 收束全文，避免读者因前文的 lucid dreaming 或 treatments 而误以为噩梦已经被完全解释。它呼应文章主旨中的“噩梦复杂且尚未被完全理解”，使全文保持严谨、开放的说明文立场。

    识别未知与已知的边界
SELF CHECK · 段落自检题

6 道逐段细节自检题

针对2021年12月英语四级真题第3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 after waking nightmare

    What does the opening description suggest about the dreamer after waking from a nightmare?

    • A The dreamer immediately falls asleep again after calming down.
    • B The dreamer is mainly worried about a real killer outside.
    • C The dreamer remains frightened despite realizing that the event was only a dream.
    • D The dreamer cannot remember anything about the nightmare.
    • E The dreamer feels cold because of an illness.
    • F The dreamer is convinced that nightmares are harmless.
    显示答案与解析 收起答案与解析

    正确答案：C

    原文先给出自我安慰：It was just a nightmare，随后用 But 和 still filled with fear 进行反转。因此正确项完整保留了“理性上知道安全”与“情绪上仍恐惧”的并存关系。障碍在于，选项把原文的具体画面压缩成概括表达；考生必须识别 despite 对应的是 but 的逆转逻辑。

    盯死转折后半句 时间最紧张时，直接用题干中的 after waking 扫描 第1段，不必逐句翻译。随后采用“转折句截尾法”：只盯住 but 之后的状态表达，并检查选项中谁保留了前半句的认知让步与后半句的情绪延续；保留该双层关系的正确项即为答案项。

  2. 第 2 段 定位词 possibility bad dreams

    What possibility does the writer raise concerning bad dreams?

    • A Bad dreams can be fully explained by stressful events.
    • B Dreamers should avoid sleeping after unpleasant experiences.
    • C Nightmares disappear naturally once dreamers wake up.
    • D People may be able to prevent or stop nightmares while they are occurring.
    • E Only doctors can decide whether a dream is bad.
    • F Dreamers can choose the content of every dream before sleep.
    显示答案与解析 收起答案与解析

    正确答案：D

    该项对应原文的 avoid, or even turn off 和 as they happen。may 保留了原文的开放性，没有把问题误写成已经证实的结论。障碍在于 prevent 或 stop 是对 avoid 或 turn off 的同义改写，考生需抓住动作方向均是“干预正在发生的噩梦”。

    核对动作宾语 在 第2段 中优先扫问号和 is there a way，而不是翻译整段。把题干 possibility 映射为“问句中的可行性”，然后只比较各选项的动作宾语：正确项的动作直接作用于 nightmares，且保留发生中的时间限制；这就是答案项。

  3. 第 3 段 定位词 some studies lucid dreaming

    According to some studies, how might lucid dreaming help people with nightmares?

    • A It guarantees that dreamers will never have another nightmare.
    • B It helps dreamers wake up as soon as a nightmare begins.
    • C It allows doctors to identify the causes of sleep disorders.
    • D It removes the need for medicines and therapies.
    • E It may enable them to recognize a nightmare and possibly control it without waking up.
    • F It makes people remember every detail of their dreams.
    显示答案与解析 收起答案与解析

    正确答案：E

    该项压缩复现了 lucid dreaming 的定义：be aware that a nightmare is happening，以及 possibly even control it without waking up。may 和 possibly 精确保留研究结论的保留语气。障碍在于原文的长破折号插入定义，考生若只读主干，容易漏掉真正的 mechanism。

    破折号三钩 在 第3段 不读完整主句，直接切入 lucid dreaming 后的破折号释义区。用“三钩核验”：是否有意识到发生、是否可能控制、是否不醒来；同时检查语气是否为 may 或 possibly。三个内容钩与语气检查均通过的正确项就是答案项。

  4. 第 4 段 定位词 doctors occasional nightmares

    How do doctors generally view occasional nightmares?

    • A They consider every nightmare a sign of a serious disease.
    • B They believe occasional nightmares are caused only by drugs.
    • C They treat occasional nightmares with medicines immediately.
    • D They think nightmares occur only in children.
    • E They cannot distinguish nightmares from sleep disorders.
    • F They typically do not regard them as a problem.
    显示答案与解析 收起答案与解析

    正确答案：F

    该项是 doctors typically don't consider occasional nightmares a problem 的同义改写，typically 对应 generally，do not regard 对应 don't consider。障碍是原文后文立刻谈 sleep disorder，容易让考生误把“偶发噩梦”与“噩梦障碍”混为一谈。

    遮住频率验范围 直达 第4段，先用 doctors 找到评价句，再执行“频率词遮盖测试”：暂时遮住 occasional，看看选项是否把结论扩大到 every nightmare；凡扩大范围者立即排除。保留 occasional 条件并复现否定评价的正确项即为答案项。

  5. 第 5 段 定位词 American Academy of Sleep Medicine treating nightmare disorder

    What does the review by the American Academy of Sleep Medicine indicate about treating nightmare disorder?

    • A A number of medicines and therapies for the disorder are supported by rigorous research.
    • B Only one medicine has been proven to cure nightmare disorder completely.
    • C The review found that therapies are less useful than drugs.
    • D No reliable research on nightmare disorder treatment is available.
    • E The Academy recommends treating all occasional nightmares with drugs.
    • F The review was based on dreamers' personal stories rather than research.
    显示答案与解析 收起答案与解析

    正确答案：A

    该项准确改写 there are a number of medicines and therapies that are backed by rigorous research。A number of 保留数量上的非单一性，supported by 对应 backed by，且把对象限定为 the disorder。障碍在于原文插入了较长的机构、review 和期刊信息，主干容易被遮蔽。

    证据疗效切割 直接凭 American Academy of Sleep Medicine 跳至 第5段，忽略插入的期刊信息，只抽取主干：there are treatments backed by research。接着执行“证据—疗效切割”：题目只问 evidence status，凡谈 cure、优劣比较或全面用药的选项都不是答案项；描述研究支持的正确项即为答案项。

  6. 第 6 段 定位词 currently known different kinds of nightmares

    What is currently known about the occurrence of different kinds of nightmares?

    • A Researchers have already explained all the causes of nightmares.
    • B People tend to experience different types of nightmares at different stages of the sleep cycle.
    • C Every kind of nightmare occurs at the same point in the sleep cycle.
    • D Children experience nightmares only during the deepest sleep stage.
    • E Sleep disorders occur only after unpleasant experiences.
    • F Lucid dreaming changes the length of the sleep cycle.
    显示答案与解析 收起答案与解析

    正确答案：B

    该项忠实改写 people tend to have different kinds of nightmares at different points during the sleep cycle。tend to 保留非绝对的频率，different types 与 different stages 也完整呈现分类和时间变量的对应。障碍在于本段前半部分强调 complicated 和 struggling，易使考生误选“什么都不知道”。

    已知句配对 在 第6段 先不看第一句的复杂性描述，直接扫描 what we do know 这一 certainty anchor。随后使用“配对箭头法”：把 different kinds 与 different points 画成双向配对，再检查选项是否保留 tend to 的软语气。保留这组配对的正确项就是答案项。

STRUCTURE · 篇章结构

4 个意群的说明文骨架

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

  1. P1 P2

    噩梦场景描写与问题引入

    通过 vivid description 生动描绘了 nightmare 带来的 physical and emotional reactions,比如 sweating、racing heart、fear 等感受,然后 naturally transition 到核心 question,也就是能否 avoid or control 这些 bad dreams

    这个 opening 通过 experiential description 建立 emotional connection,让 readers 产生 empathy 和 resonance,然后 pose the central question 关于如何 deal with nightmares,这是 expository writing 中典型的 problem-oriented introduction,为后文 exploring solutions 做好 preparation

    呈现困扰性噩梦体验
  2. P3

    潜在解决方案——清醒梦

    针对前面的 question,这段提出 potential solution 也就是 lucid dreaming,强调 research is limited 但 some studies suggest 这种 ability to be aware 和 control nightmares 可能是 the answer,体现 cautious optimism

    作为 response to the question,这段 introduce a specific approach,虽然用 hedging language 比如 limited、suggest、may 来 qualify the claim,这符合说明文的 objective tone,同时 transition 文章从 problem identification 到 solution discussion,是 expository structure 中的 key turning point

    提出清醒梦控制噩梦的可能性
  3. P4 P5

    噩梦的背景知识与常规应对

    这部分 shift focus 到 general background,说明 nightmares 是 human experience 尤其对 kids,doctors 通常 don't consider occasional ones 为 problem,可能是 symptoms of sleep disorder,然后 introduce treatment options 包括 medicines and therapies backed by rigorous research,整体 broaden the context

    经过前面的 specific solution,文章 zoom out 提供 comprehensive picture,包括 nightmare 的 normalcy、potential causes、以及 established treatments,这种 from specific to general 的 move 是说明文的 common strategy,目的是 give readers full understanding,同时 balance 前面 limited research 的 caution

    介绍噩梦障碍的多种治疗方案
  4. P6

    研究局限与复杂性承认

    最后这段用 however 进行 contrast,强调 nightmares are complicated 且 researchers are still struggling,虽然 we do know 一些关于 different kinds 在 sleep cycle 中的 patterns,整体 acknowledge the limitations 和 ongoing nature of research,给文章一个 honest conclusion

    作为 closing section,这段 return to the theme of uncertainty,和 opening 的 question 以及中间 limited research 的 qualification 形成 echo,说明文通过这种 honest acknowledgment 维持 credibility,同时 leave room for future research,这是 scientific expository writing 的 characteristic ending

    说明噩梦复杂且未被充分理解
MAIN IDEA · 速判主旨

5 步定位这篇文章的主旨

不读完全篇也能锁定主旨——以下 5 步按2021年12月英语四级真题第3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. 开篇场景定位主题词 P1 P2

    说明文通常 open with 一个 vivid example 或 relatable situation 来 introduce the topic，这个 opening scene 就是 entry point。第一段的 nightmare description 立刻 reveals 文章要 discuss 的 subject matter。

  2. 提问句界定探讨范围 P2

    说明文的 core purpose 常常是 answer a question 或 explain a phenomenon。第2段 直接提出 'is there a way to avoid or turn off these bad dreams'，这个 direct question 就是文章的 driving force，它 defines 文章要 address 什么。

  3. 方案类词汇标记范围 P3 P5

    说明文在 present problem 后通常会 shift to discussing solutions 或 current understanding。第3段 的 'may hold the answer' 和 第5段 的 'treatments' 表明文章不仅 describe problem，还 explore possible solutions，这 expands 主旨的 coverage。

  4. 结尾限定词揭示态度 P6

    说明文的 complete picture 往往包括 acknowledge complexity 或 current limitations。第6段 的 'however, nightmares are complicated' 和 'still struggling to understand' 表明文章不是 presenting definitive answers，而是 showing current state of knowledge，这是 main idea 的 crucial component。

  5. 四层结构综合提炼 P1 P2 P3 P4 P5 P6

    说明文主旨是 multi-layered 的，需要 combine topic + purpose + stance。单看某一段 cannot capture full picture。通过 sequentially tracking these four elements，你能 construct 一个 comprehensive 且 accurate 的 main idea statement。

主旨信号词 nightmare(s) P1 lucid dreaming P3 research P3 treatment P5 complicated P6

MAIN IDEA · 主旨

这篇文章在说什么

噩梦是常见的人类体验,可能令人不安。虽然研究有限,但清醒梦可能帮助人们控制或避免噩梦。针对噩梦障碍存在多种治疗方法,但噩梦仍然复杂且未被研究人员完全理解。
Nightmares are common human experiences that can be distressing. While research is limited, lucid dreaming may help people control or avoid bad dreams. Various treatments exist for nightmare disorders, but nightmares remain complex and not fully understood by researchers.
WORD INFERENCE · 生词推断

3 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。

  • unsettling 令人不安的、扰乱心神的

    让我们把所有 clues 串联起来:首先,从 parallel structure 看,unsettling 和 haunting 共同修饰 nightmares,它们是 coordinate adjectives,表达相似的 negative meaning。其次,从 word formation 看,un+settle+ing 的结构明确传达了 not allowing one to feel settled 的含义。最后,从 discourse logic 看,作者在 asking 如何 avoid 这样的 nightmares,证实这个词描述的是 unwanted psychological state。这三条 lines of evidence 共同指向同一个 conclusion。

    词根识别加语境验证法
  • lucid 清醒的、神志清楚的

    让我们 synthesize 这些 evidence:同位语 directly defines lucid dreaming 为 conscious awareness during dreams,这是最 explicit 的 clue。从 functional perspective,它被提出作为 nightmare 的 potential solution,这 requires mental clarity。从 conceptual contrast 看,它区别于 ordinary unconscious dreaming。这三个 angles 都指向 lucid 表示 clear-minded、conscious、aware 的含义。

    同位语定义加功能分析法
  • rigorous 严谨的、严密的、细致彻底的

    综合来看:从 domain perspective,医学领域对 research quality 有 strict requirements;从 collocation 角度,backed by rigorous research 这个 phrase 表明 research 必须足够 solid 才能 support treatments;从 publication context 看,academic journal 和 medical academy 的 involvement 都 reinforce rigorous 指 meeting high scientific standards。所有 evidence 都指向 strict、thorough、careful 的含义。

    领域标准加固定搭配推断法
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。

  • 举例子

    P1

    文章在 第1段 用了一个 vivid example 来展现 nightmare 的真实体验：汗湿的床单 (damp sheets)、心跳加速 (racing heart)、像被追赶的感觉 (chased down a dark street)。这个 concrete scenario 让 abstract concept 变得 tangible，帮助 readers 立刻 relate to 噩梦的 unsettling nature，为后续讨论 nightmare 的 treatment 打下 emotional foundation。

    信号词 for example for instance such as like consider imagine take...as an example

    仿写： 当你要 explain 一个 abstract phenomenon 时,可以问自己: What does this look/feel like in real life? 比如讨论 stress,不要只说 'pressure affects people',而是描述: 'Your hands tremble before the exam, your mind goes blank...' 模版: [Sensory details + emotional state + physical symptoms] 来 create 一个 immersive scene,让 readers immediately understand what you mean。

  • 下定义

    P3

    在 第3段 文章 defines lucid dreaming: 'the ability to be aware that a nightmare is happening and possibly even control it without waking up'。这个 precise definition 是 crucial 的,因为 lucid dreaming 对很多 readers 来说是个 unfamiliar term。Clear definition 确保 audience 能 follow 后续关于这个 potential solution 的 discussion,避免 misunderstanding,让文章的 logical progression 更加 solid。

    信号词 is means refers to defined as that is in other words namely i.e.

    仿写： 当 introducing technical terms 或 unfamiliar concepts 时,用这个 pattern: [Term] + is/refers to/means + [category it belongs to] + [distinguishing features]。比如: 'Procrastination is a behavior pattern where individuals delay tasks despite knowing negative consequences.' 关键是 balance precision with simplicity,用 readers 已知的 words 去 explain 未知的 concepts。Avoid circular definitions 和 overly complex language。

  • 分类别

    P6

    第6段 提到 'people tend to have different kinds of nightmares at different points during the sleep cycle'。虽然文章没有 elaborate 具体的 categories,但它 indicates nightmare 的 complexity 通过 acknowledging 存在 different types。这个 classification approach 支持文章的 main point: nightmares are complicated,not fully understood,需要 nuanced research 和 individualized treatment。

    信号词 types of kinds of categories of classified into divided into fall into can be grouped as

    仿写： 当 dealing with complex topics 时,问: Can this be divided into distinct types? 用这个 structure: [General topic] can be classified into [number] types: [Type A] which [feature], [Type B] which [feature]... 比如: 'Learning styles fall into three main categories: visual learners who process information through images, auditory learners who learn through listening, and kinesthetic learners who need hands-on experience.' 确保 categories mutually exclusive 且有 clear criteria。

  • 作诠释

    P4

    第4段 explains: 'Doctors typically don't consider occasional nightmares a problem. They can just be symptoms of a sleep disorder that can result from an unpleasant experience, stress, or certain drugs.' 这里 interprets nightmares 的 medical context,clarifying when they're normal vs. problematic。这个 interpretation 对 main idea 很重要,因为它 establishes 并非所有 nightmares 都需要 treatment,为后续讨论 nightmare disorder 的 specific treatments 提供了 reasonable scope。

    信号词 this means in other words that is to say to put it another way essentially basically what this suggests

    仿写： Use interpretation to add depth after presenting facts。Pattern: [Statement of fact] + This means/suggests/indicates that + [deeper meaning/implication]。比如: 'Only 30% of students completed the assignment on time. This suggests that either the instructions were unclear or the workload was unrealistic for the given timeframe.' 关键是 connect surface information to underlying significance,帮助 readers see beyond obvious。

  • 引资料

    P5 P6

    第5段 cites 'the American Academy of Sleep Medicine' 和 'Journal of Clinical Sleep Medicine' 来 support 关于 treatments 的 claims。第6段 quotes 'Dr. Rachel Salas, an expert on sleep disorders and an associate professor at Johns Hopkins Medicine'。这些 authoritative sources 增强文章 credibility,表明 information 是 research-backed 而非 speculation,这对 main idea 至关重要——既说明 treatments exist,又 acknowledge research limitations。

    信号词 according to research shows studies suggest experts say as reported by evidence indicates [Expert name] states published in

    仿写： When making significant claims,问: Who says so? Pattern: According to [source/expert], [statement]. 或 [Statement], [source] reports/found/states. 比如: 'According to a 2023 Stanford study, sleep deprivation reduces cognitive performance by up to 40%.' 确保 sources credible (academic institutions, peer-reviewed journals, recognized experts),并 provide enough context (credentials, publication) 让 readers assess reliability。

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。

  • 噩梦的恐惧感超越理性认知

    P1
    It was just a nightmare, you tell yourself; there's nothing to be afraid of. But you're still filled with fear.

    转折类 But but however yet nevertheless nonetheless still

    这个 but 创造的 contrast 传递了一个 crucial implication：噩梦的 psychological impact 是 irrational 且 powerful 的，它 override 我们的 conscious reasoning。虽然 rationally 知道「只是梦」nothing to fear，but emotionally 仍然被 fear 控制。这个 implied meaning 为整篇文章 establish 了 foundation，说明 nightmares 不仅仅是 simple mental events，而是有 profound emotional power 的 phenomena，这 justify 了后文探讨 treatment methods 的 necessity，因为 rational awareness alone 不足以 解决问题。

  • 研究的局限性暗示结论的不确定性

    P3
    Research is limited, but some studies suggest that people who can master lucid dreaming... may hold the answer.

    让步转折类 Research is limited, but limited but some suggest may possibly suggest indicate

    这句通过 layered hedging 传递了 multiple implications：首先，limited research 暗示 lucid dreaming 作为 solution 还没有 solid scientific consensus；其次，some studies suggest 而非 studies prove，表明 evidence 是 preliminary 的；再次，may hold the answer 而非 holds the answer，进一步 weaken 确定性。这些 cumulative qualifiers 的 implied meaning 是：虽然 lucid dreaming 是个 promising direction，但读者不应 expect definitive cure，而应理解这是个 ongoing research area。这个 implication 为文章 maintain scientific rigor，avoid overstating claims，同时也 foreshadow 了后文提到的「nightmares are complicated」这个 theme。

  • 医学界对偶发噩梦的不重视

    P4
    Doctors typically don't consider occasional nightmares a problem.

    否定表达类 typically don't consider don't consider not regarded as typically not rarely view as seldom treat as hardly seen as

    这句的 implied meaning 是建立 nightmare 的 severity spectrum：occasional（偶尔的）nightmares 属于 normal human experience 不需要 medical intervention，但这 implicitly suggests frequent 或 chronic nightmares 就 cross 了需要 treatment 的 threshold。这个 implication 对文章主旨很关键，因为它 distinguish 了 normal vs. pathological nightmares，为后文 introduce nightmare disorder 和 various treatments 做了 logical preparation。它暗示并非所有 nightmares 都需要本文讨论的 interventions，只有达到 disorder level 的才需要。

  • 研究支持的治疗方法存在范围局限

    P5
    there are a number of medicines and therapies that are backed by rigorous research

    模糊数量词类 a number of some several various multiple a range of certain

    A number of 配合 backed by rigorous research 这个 qualifier 传递了 nuanced implication：虽然有 multiple treatment options 可用，但作者 specifically highlight 那些有 rigorous research support 的，这 implicitly suggests 市面上可能还有其他 treatments 但缺乏 solid scientific backing。这个 implied meaning 对主旨很重要，因为它在 acknowledge treatment availability 的同时，也 subtly warn 读者要选择 evidence-based options。这 reinforce 了文章 scientific and cautious tone，避免给人「所有 nightmare treatments 都同样有效」的 impression。

  • 专家权威承认知识缺口

    P6
    However, nightmares are complicated, and researchers are still struggling to understand them

    转折加现在进行时类 However, still struggling however, still but still yet still are struggling are still trying remain challenging

    这句的 however 在 present 了 treatments 之后 introduce 一个 major caveat：尽管有 treatment options，但对 nightmares 的 fundamental understanding 仍然 incomplete。An expert 用 still struggling 这种 strong language 来 describe researchers' situation，implicitly convey 这个 field 的 complexity 远超 current knowledge。这个 implication 对全文主旨至关重要，它 explain 为什么前面的 research was limited，为什么 treatments 虽然存在但可能不是 perfect solutions。It frames nightmares as an ongoing mystery，给全文一个 humble, realistic conclusion，避免 overconfident claims about our ability to control or eliminate nightmares。

  • 已知知识的有限性凸显

    P6
    What we do know is that people tend to have different kinds of nightmares at different points during the sleep cycle.

    范围限定类 What we do know what we do know what we can say what is clear what is certain we do know that it is known that

    这句通过 what we do know 这个 limiting phrase 传递了 profound implication：在讲了 struggling to understand 之后，接下来给出的 concrete knowledge 却只是一个 relatively superficial observation（不同 sleep stages 有不同 nightmares）。这种 contrast between 宣称的「我们知道的」和 actual minimal content，implicitly communicate 我们对 nightmares 的 understanding 极其 limited。这个 implication 强化了全文主旨的最后一个 component：nightmares remain complex and not fully understood。它给读者一个 realistic expectation：即使有 treatments，我们对 underlying mechanisms 的理解还很 primitive，这也解释了为什么不同 people 需要 different approaches 和为什么没有 universal solution。

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 informative with cautious optimism）。下面是按步骤还原的判断过程与文中的态度信号词。

  1. 开篇语言的描述性与评价性 P1

    说明文的 opening tone 往往 reveal 作者的 basic stance。如果作者用 neutral description 而非 evaluative words，说明他在 maintain objectivity。这里作者用 'damp with sweat' 和 'heart racing' 这些 descriptive details，但没有说 nightmares are terrible 或 should be eliminated，体现了 informative approach。

  2. 核心问题的探索性与结论性 P2

    说明文作者如果用 question format 来 structure the article，通常意味着他在 present different perspectives 而非 push one agenda。这种 inquiry-based approach 是 neutral stance 的典型 marker，因为作者在 invite exploration 而非 demand acceptance。

  3. 限定性语言的频率与强度 P3 P4 P5 P6

    说明文中的 hedging words 是 identify objectivity 的关键 indicators。当作者用 'limited'、'suggest'、'may'、'still struggling' 这类 words，他在 acknowledge uncertainty 和 avoid overgeneralization，这是 scientific objectivity 的 hallmark。相反，如果用 'definitely'、'always'、'must' 就会 reveal bias。

  4. 权威引用与认知局限承认 P5 P6

    说明文作者如果 consistently cite credible sources 并 admit knowledge gaps，他在 demonstrate intellectual honesty 和 objectivity。这种 approach shows 作者不是 promote his own agenda，而是 serve as an information conduit，letting experts' findings speak for themselves。

  5. 多维度态度特征的综合评估 P1 P2 P3 P4 P5 P6

    通过 synthesize 前面的 findings，我们看到作者的 attitude 是 multi-dimensional 但 consistent：用 descriptive opening 建立 objectivity，用 question format 引导 exploration，用 hedging language 保持 caution，用 expert citations 确保 credibility。这些 elements combined 构成了 neutral yet informative stance，其中的 'cautious optimism' 体现在作者 present lucid dreaming 作为 potential solution 时用了 'may hold the answer' 而非 'will solve the problem'。

文中的态度信号词

  • limited P3

    这个 word 'limited' 直接 modify 'research'，表明作者在 acknowledge 当前 knowledge 的 boundaries。在说明文中，用 'limited' 来 describe evidence base 是 objectivity 的 strong signal，因为作者没有 overstate 现有 findings 的 conclusiveness，而是 honestly present 研究的 current state。

    同类词 restricted insufficient scarce preliminary incomplete

  • suggest P3

    动词 'suggest' 在 'some studies suggest' 这个结构中 weaken 了 assertion 的 strength。在说明文中，用 'suggest' 代替 'prove' 或 'show' 表明作者在 present findings tentatively，not as established facts。这 creates distance between the author and the claims，maintaining objectivity。

    同类词 indicate imply hint point to seem to show

  • may P3

    Modal verb 'may' 在 'may hold the answer' 中 introduce uncertainty into the claim。在说明文中，'may' 是 epistemic modality 的典型 marker，表示作者 recognize 一个 outcome 的 possibility 而非 inevitability。这种 linguistic choice prevents 作者 from appearing overly confident or biased toward a particular solution。

    同类词 might could can possibly potentially perhaps

  • typically P4

    Adverb 'typically' 在 'Doctors typically don't consider' 中 indicate 这是 general pattern 而非 universal rule。在说明文中，用 'typically' 是作者在 acknowledge exceptions 和 avoid absolute statements。这 shows 作者 understand 医学现象的 variability 并 respect individual differences。

    同类词 generally usually often commonly frequently

  • rigorous P5

    形容词 'rigorous' 在 'backed by rigorous research' 中 emphasize 所引用研究的 quality standard。在说明文中，用 'rigorous' 表明作者 value scientific methodology 并只 present well-validated findings。这 establishes credibility 并 shows 作者在 rely on high-quality evidence 而非 anecdotal claims。

    同类词 systematic thorough comprehensive extensive well-designed

  • complicated P6

    形容词 'complicated' 在 'nightmares are complicated' 中 acknowledge 主题的 inherent complexity。在说明文中，用 'complicated' 表示作者在 resist oversimplification 并 recognize 现象的 multidimensional nature。这 prevents 作者 from offering simplistic explanations or solutions。

    同类词 complex intricate multifaceted nuanced challenging

  • still struggling P6

    短语 'still struggling' 在 'researchers are still struggling to understand' 中 explicitly admit 当前认知的 incompleteness。在说明文中，这种 frank admission 是 intellectual honesty 的 strong marker，表明作者在 present 科学作为 ongoing process 而非 finished product。这 builds trust with readers。

    同类词 continue to investigate remain uncertain not yet fully understood ongoing research further study needed

  • tend to P6

    短语 'tend to' 在 'people tend to have different kinds' 中 soften 一个 generalization about human experience。在说明文中，'tend to' 表明作者在 describe probabilities 而非 certainties，acknowledging individual variation。这 prevents overgeneralization 并 maintains scientific accuracy。

    同类词 are likely to have a tendency to are prone to inclined to more often than not

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. 开头场景化描述 P1

    第1段 通过 vivid description 描绘了 nightmare 后的 physical sensations，这是在 set up a topic，而议论文会直接 state a viewpoint，新闻报道会用 who/when/where 的 factual lead 开头。

  2. 提出机制性问题 P2

    第2段 用 'is there a way' 提出了关于 how to avoid nightmares 的 question，这是典型的说明文 structure，而议论文会问 'should we' 这类 value judgment questions，新闻不会用 question 来 organize content。

  3. 引用研究和专家 P3 P4 P5 P6

    第3段 到 第6段 通过 'research suggests'、'studies'、'doctors consider'、'expert said' 等 authoritative sources 来 explain nightmares 和 treatment methods，这是 informative exposition，不是 persuasive argumentation 也不是 news reporting of events。

  4. 中立客观表述 P3 P4 P5 P6

    全文用 'research is limited'、'tend to have'、'struggling to understand' 这些 tentative expressions，显示 objective presentation of current knowledge，而议论文会有 'must'、'should'、'it is crucial' 等 persuasive language，新闻会有 timeliness indicators 如 'yesterday'、'announced'。

  5. 四维快速识别法 P1 P2 P3 P4 P5 P6

    这篇文章完美符合说明文的 four-point framework：用 nightmare scene 作 introduction，提出 'how to avoid' 的 mechanism question，用 research 和 expert views 来 explain，保持 objective tone throughout。这些 features 共同构成了 expository article 的 signature pattern。

哪些词暴露了说明文体裁？

  • Research is limited, but some studies suggest P3 研究引用与知识呈现词 research shows studies suggest according to research scientists have found evidence indicates
  • What we do know is that P6 知识界定与认知范围词 what we know is it is known that we understand that experts recognize that it is established that
  • that is, the ability to P3 定义解释与概念阐释词 that is in other words namely which means defined as
  • according to the American Academy of Sleep Medicine P5 权威来源引证词 according to as stated by experts from researchers at scientists at
  • Doctors typically don't consider P4 专家观点陈述词 experts believe specialists say doctors recommend researchers observe scientists note
  • They can just be symptoms of P4 因果关系与机制解释词 can be caused by results from is due to stems from can be attributed to
  • However, nightmares are complicated, and researchers are still struggling to understand them P6 知识局限性陈述词 remains unclear is not yet understood scientists are still investigating research is ongoing the mystery persists
  • there are a number of medicines and therapies P5 分类列举与范畴介绍词 there are several types can be classified into includes various consists of multiple encompasses different
SENTENCE INSIGHTS · 句子精讲

7 句真题句逐层精讲

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

FAQ · 常见问题

关于 《你能“关掉”噩梦吗?》 的常见问题

2021年12月英语四级真题第3套 Part III Section A 文章 Can you 'turn off’ a nightmare? 的原文出自哪里？
2021年12月英语四级真题第3套 Part III Section A 文章 Can you 'turn off’ a nightmare? 选自 2020年2月16日刊登在 www.livescience.com(生活科学网站)上的一篇标题为“Can you 'turn off’ a nightmare?”(《你能“关掉”噩梦吗?》)的文章。
2021年12月英语四级真题第3套文章《你能“关掉”噩梦吗?》的主旨是什么？
噩梦是常见的人类体验,可能令人不安。虽然研究有限,但清醒梦可能帮助人们控制或避免噩梦。针对噩梦障碍存在多种治疗方法,但噩梦仍然复杂且未被研究人员完全理解。（英文表述：Nightmares are common human experiences that can be distressing. While research is limited, lucid dreaming may help people control or avoid bad dreams. Various treatments exist for nightmare disorders, but nightmares remain complex and not fully understood by researchers.）
Can you 'turn off’ a nightmare?（2021年12月英语四级真题第3套文章）是什么体裁？难度如何？
体裁为说明文，作者立场是客观中立（objective and informative with cautious optimism）。CEFR 难度 B2，全文 245 词、6 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3套文章《你能“关掉”噩梦吗?》的篇章结构是怎样的？
全文 6 段按说明文骨架分为 4 个意群：第1段、第2段——噩梦场景描写与问题引入；第3段——潜在解决方案——清醒梦；第4段、第5段——噩梦的背景知识与常规应对；第6段——研究局限与复杂性承认。
Can you 'turn off’ a nightmare? 一文的作者态度是什么？
作者态度是客观中立（objective and informative with cautious optimism）。判断路径：开篇语言的描述性与评价性 → 核心问题的探索性与结论性 → 限定性语言的频率与强度 → 权威引用与认知局限承认 → 多维度态度特征的综合评估；文中的态度信号词包括 limited（第3段）、suggest（第3段）、may（第3段）、typically（第4段）、rigorous（第5段）、complicated（第6段）、still struggling（第6段）、tend to（第6段）。
2021年12月英语四级真题第3套文章 Can you 'turn off’ a nightmare? 中有哪些值得积累的生词？
按文中出现顺序共 3 个：unsettling（令人不安的、扰乱心神的）、lucid（清醒的、神志清楚的）、rigorous（严谨的、严密的、细致彻底的），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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