懒笔记
2018年6月英语六级真题第2套 Part II Section C (1)
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2018年6月英语六级真题第2套 Part II Section C (1)

议论文 · 听力 · 真题文章逐层精读

本页是 2018年6月英语六级真题第2套 Part II Section C (1) 文章的精读视角页——这篇议论文全文 399 词、7 段，CEFR 难度 C1（C1 级在英语六级文章中占 58%），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

7 段英文原文

以下为2018年6月英语六级真题第2套 Part II Section C (1) 的听力原文，共 7 段。左侧 P1–P7 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。

Governments, private groups and individuals spend billions of dollars a year trying to root out non-native organisms that are considered dangerous to ecosystems, and to prevent the introduction of new intruders.

But a number of scientists question the assumption that the presence of alien species can never be acceptable in a natural ecosystem. They say that portraying introduced species as inherently bad is an unscientific approach.

Distinctions between exotic and native species are artificial, said Dr. Michael Rosenzweig, a professor of evolutionary biology at the University of Arizona, because they depend on picking a date and calling the plants and animals that show up after that date exotic. Ecosystems free of species defined as exotic are, by default, considered the most natural.

"You can't roll back the clock and remove all exotics or fix habitats," Dr. Rosenzweig said. "Both native and exotic species can become invasive, and so they all have to be monitored and controlled when they begin to get out of hand."

At its core, the debate is about how to manage the world's remaining natural ecosystems and about how, and how much, to restore other habitats. Species that invade a territory can harm ecosystems, agriculture and human health. They can threaten some native species or even destroy and replace others. Next to habitat loss, these invasive species represent the greatest threat to biodiversity worldwide, many ecologists say.

Ecologists generally define an alien species as one that people, accidentally or deliberately, carried to its new location. Across the American continents, exotic species are those introduced after the first European contact. That date, rounded off to 1500 AD, represents what ecologists consider to have been a major shift in the spread of species, including crops and livestock, as they began to migrate with humans from continent to continent.

Only a small percentage of alien species cause problems in their new habitats, said Don Smith, professor of ecology and evolutionary biology at the University of Tennessee. Of the 7,000 alien species in the United States—out of a total of 150,000 species—only about 10 percent are invasive, he pointed out. The other 90 percent have fit into their environments and are considered naturalized. Yet appearances can deceive, ecologists caution, and many of these exotics may be considered acceptable only because no one has documented their harmful effects. What is more, non-native species can appear harmless for decades, then turn invasive.

PARAGRAPHS · 逐段精读

7 段逐段主旨与解读

逐段拆解2018年6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

    Current Anti-Invasive Species Investment

    Governments and organizations invest billions annually to eliminate non-native species viewed as threats to ecosystems.

    这个 opening paragraph 为文章主旨服务，是通过 presenting 一个 widely accepted practice 来 set up contrast。既然文章要 argue 说 portraying alien species as inherently bad 是 unscientific，那么首段就需要 establish 这个 portrayal 确实 exists 并且有 significant backing（billions of dollars 就是 evidence）。段落没有直接 state opposition，但通过描述 massive efforts to eliminate non-natives，它 implicitly highlights 这个 assumption 有多 deeply entrenched，从而让后续的 challenge 显得更有 significance 和 necessity。这是典型的 problem-solution structure 中的 problem presentation。

    识别数据和行动描述
  2. P2

    Scientific Challenge to Anti-Alien Consensus

    Scientists challenge the assumption that alien species are inherently harmful, calling this portrayal unscientific.

    这个段落是文章主旨的 direct articulation。如果主旨是 conventional view 过于 simplistic 且 unscientific，那么这段就是 explicitly stating 这个 position。通过引入 scientists 作为 credible sources，段落为这个 controversial claim 建立了 legitimacy。Question 和 unscientific 两个词非常 strategic——前者表明这是 intellectual inquiry 而非 ideological opposition，后者则把 debate 框定为 methodological issue 而非 value judgment。这段为后续 paragraphs 设定了 argumentative agenda：需要 demonstrate 为什么 current approach 是 unscientific，以及什么是 more scientific alternative。

    定位转折和评价
  3. P3

    The Artificial Nature of Species Classification

    The distinction between exotic and native species is artificial, based on arbitrary date selection rather than ecological reality.

    这个段落为文章主旨提供了 first line of evidence。如果要 argue 说 conventional view 是 unscientific，就需要 show 它的 conceptual foundation 有 flaws。通过 expose date-dependency 和 artificial nature of classification，段落 demonstrates 说 native-exotic distinction 不是 objective biological category，而是 socially constructed temporal demarcation。这个 argument 非常 strategic，因为它 attacks 整个 anti-exotic framework 的 premise——如果 distinction 本身是 arbitrary，那么基于这个 distinction 的 management policies 就 lack solid ground。段落为后续更 practical 的 arguments 提供了 theoretical justification。

    提取专家论证逻辑
  4. P4

    Pragmatic Management Approach

    Complete removal of exotic species is impossible; both native and exotic species require monitoring based on invasive behavior, not origin.

    这个段落推进文章主旨，从 conceptual critique 转向 practical alternative。如果主旨是 reject automatic rejection of non-natives，那么需要 offer 一个 workable alternative。段落做了两件事：first，establish 说 complete removal 是 unrealistic goal，这 undermines purism in ecosystem management；second，propose 一个 behavior-based approach，这是 more scientific 因为它 focuses on actual impacts 而非 assumed threats。Both native and exotic can be invasive 这个 statement 特别 powerful，因为它 removes 道德 high ground from native species，把 discussion 框定为 ecological function 而非 origin politics。这 aligns perfectly with 文章主旨关于 simplistic views 的 critique。

    识别限制和方案
  5. P5

    Reframing the Management Debate

    The core debate concerns ecosystem management strategies, though invasive species do pose serious threats to biodiversity.

    这个段落在文章主旨中起 pivotal role，因为它 preempts potential objection。如果 argue 说不应该 automatically reject exotics，反对者可能说这 ignores real dangers。这段通过 acknowledge invasive species 的 genuine threats，作者 demonstrates 不是 naive idealism。But 关键在于 how paragraph frames the issue——不是 whether to manage invasive species，而是 how to identify them and what management philosophy to adopt。By placing emphasis on debate about management approaches，段落 redirects discussion from outcome（protecting biodiversity）to method（how we define and respond to threats），这正是文章主旨要 address 的 core issue。

    区分承认与强调
  6. P6

    Defining Alien Species

    Alien species are defined by human-mediated introduction, with 1500 AD marking a somewhat arbitrary temporal boundary in the Americas.

    这个段落看似 neutral exposition，实则 subtly supports 文章主旨。通过 spell out 具体的 definition 和 temporal marker，段落 makes visible 前面段落 abstract critique 的 concrete manifestation。Rounded off to 1500 AD 这个 detail 特别有力——它 shows 说 supposedly scientific classification 依赖 approximate historical dates。Ecologists consider 这个表达也 creates distance，suggesting definition 是 convention 而非 natural fact。By providing this apparently factual information，段落 actually supplies evidence for earlier claim 说 distinctions are artificial。这是 subtle argumentative strategy——用 seemingly objective exposition 来 reveal subjective foundations of classification system，从而 undermine 其 claim to scientific objectivity。

    解构定义标准
  7. P7

    Quantifying Actual Invasiveness

    Only 10% of alien species in the U.S. are invasive, though some harmless-appearing species may pose undocumented or delayed threats.

    这个段落为文章主旨提供了 crucial empirical support。如果 argue 说 treating all alien species as inherently bad 是 unscientific，那么需要 data showing most aliens aren't actually problematic。10% invasive vs. 90% naturalized 这个 ratio 是 powerful evidence against categorical rejection。同时，段落的 caveats（documentation gaps, delayed invasiveness）展现了 intellectual honesty 和 scientific caution，这 strengthens rather than weakens the overall argument。By acknowledging uncertainty while still maintaining 大多数 exotics 不是 threats，段落 models 正是文章 advocates 的那种 nuanced, evidence-based approach。这 contrasts sharply with 首段描述的 blanket eradication efforts，showing that data supports more discriminating management strategy focused on actual behavior rather than origin status。

    平衡数据和限定
SELF CHECK · 段落自检题

7 道逐段细节自检题

针对2018年6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 billions of dollars private groups

    What are governments, private groups, and individuals spending billions of dollars a year trying to do?

    • A To classify all organisms as either native or exotic.
    • B To restore every damaged habitat to its original condition.
    • C To eliminate dangerous non-native organisms and stop new ones from being introduced.
    • D To encourage alien species to migrate between continents.
    • E To prove that all introduced species are harmful to human health.
    • F To replace native species with more adaptable exotic species.
    显示答案与解析 收起答案与解析

    正确答案：C

    正确项完整对应 root out non-native organisms 与 prevent the introduction of new intruders 两个并列目标，并体现 dangerous to ecosystems 这一限定。障碍在于 eliminate 比 root out 更概括，stop new ones from being introduced 则把名词结构转换为被动动作；考生必须识别同义改写和双目标结构。

    金额后扫双目的 时间紧张时，直接以题干中 billions of dollars 的金额短语作视觉扫描，立即定位 第1段；随后不必通读其他段落，只需读取该金额所在句中 trying to 引出的并列目的。把能完整覆盖这些目的的选项标为正确项。

  2. 第 2 段 定位词 scientists alien species

    What do the scientists challenge about alien species in natural ecosystems?

    • A The view that every native species should be closely monitored.
    • B The claim that habitat loss has no effect on biodiversity.
    • C The practice of defining alien species by human transportation.
    • D The assumption that alien species can never be acceptable in a natural ecosystem.
    • E The belief that introduced species are always beneficial.
    • F The estimate that ten percent of alien species are invasive.
    显示答案与解析 收起答案与解析

    正确答案：D

    该项精确保留 question 的宾语内容：can never be acceptable。它没有把科学家的立场扩大为“所有 alien species 都有益”，而是针对绝对化 assumption。障碍在于 can never 与 acceptable 是逻辑核心，漏掉任一项都会改变立场强度。

    质疑对象反绝对化 先扫描题干中的 scientists 与 alien species，定位 第2段。不要逐项按主题词回文比对，而应优先检查各选项的逻辑力度，淘汰把质疑某种绝对判断偷换为支持相反绝对判断的选项，余下与 assumption 语法和语义均可直接相接者即为正确项。

  3. 第 3 段 定位词 Dr. Michael Rosenzweig artificial

    Why does Dr. Michael Rosenzweig consider the distinction between exotic and native species artificial?

    • A Because exotic species are always more destructive than native species.
    • B Because natural ecosystems contain no species introduced after 1500 AD.
    • C Because scientists have documented the harm caused by all exotics.
    • D Because both groups migrated with humans across continents.
    • E Because the classification depends on choosing a date after which species are labeled exotic.
    • F Because agriculture benefits more from exotic species than from native species.
    显示答案与解析 收起答案与解析

    正确答案：E

    该项对应 because they depend on picking a date and calling ... exotic，完整呈现日期标准这一论证支点。障碍是 choosing a date 属于概括改写，而 after which species are labeled exotic 将原文较长的 plants and animals that show up after that date 压缩，要求考生还原同一逻辑。

    姓名后抓因为 用姓名直接跳至 第3段，并在同一长句内只找 because 后的内容。把选项抽象成“该判断的依据是什么”；凡是不能复现来源段落所述分类依据的选项一律排除，正确项即显现。

  4. 第 4 段 定位词 Dr. Rosenzweig monitored and controlled

    According to Dr. Rosenzweig, when should species be monitored and controlled?

    • A Immediately after they arrive in a new habitat.
    • B Only when they have replaced native species completely.
    • C Whenever they are classified as exotic.
    • D After all habitats have been restored.
    • E Only after ecologists have measured their economic value.
    • F When they begin to get out of hand, regardless of whether they are native or exotic.
    显示答案与解析 收起答案与解析

    正确答案：F

    该项完整改写 when they begin to get out of hand，并保留 Both native and exotic species 的适用范围。障碍在于 regardless of whether 将 both...and... 结构转换为让步表达；考生既要抓到时机，也不能漏掉管理对象不以来源区分这一原则。

    动词后卡触发点 扫描题干 verb pair monitored and controlled，定位 第4段 后只读与其相连的 when-clause。先用条件阈值排除时间强度不符的选项，再检查适用对象是否被擅自缩窄，符合两项要求者即为正确项。

  5. 第 5 段 定位词 biodiversity worldwide many ecologists

    According to many ecologists, how do invasive species rank among threats to biodiversity worldwide?

    • A They are regarded as the second greatest threat, after habitat loss.
    • B They are considered the greatest threat, exceeding habitat loss.
    • C They pose a serious threat only to agricultural productivity.
    • D They have no measurable effect on native species.
    • E They are less dangerous than all forms of habitat restoration.
    • F They rank as a minor threat because few species become invasive.
    显示答案与解析 收起答案与解析

    正确答案：A

    正确项忠实转换 Next to habitat loss, these invasive species represent the greatest threat。after habitat loss 明确保留比较对象，second greatest 准确还原排序。障碍在于原文没有直接写 second，考生需要解析 next to 的语义，而非机械匹配 greatest。

    比较块直译名次 以 biodiversity worldwide 直达 第5段 末句，视觉上把 Next to habitat loss 与 greatest threat 视为一个不可拆分的 comparison chunk。无需重读危害例子；把该 chunk 转换成明确名次后，选择与该排序完全等值的正确项。

  6. 第 6 段 定位词 generally define alien species

    How do ecologists generally define an alien species?

    • A Any species that becomes invasive after entering a new habitat.
    • B A species that humans, deliberately or accidentally, have carried to a new location.
    • C Any organism found outside its original continent after 1500 AD.
    • D A native species that has been monitored by ecologists.
    • E A species that threatens agriculture and human health.
    • F A species that evolved naturally in an ecosystem after European contact.
    显示答案与解析 收起答案与解析

    正确答案：B

    正确项保留 people carried、accidentally or deliberately 与 new location 三个定义要件，只将 people 换为 humans、调整语序。障碍在于 deliberately or accidentally 的顺序变化不改变意义，但漏掉 human agency 或 new location 都会将定义泛化为自然迁移。

    定义句拆必要条件 看到 generally define 就直扫 第6段 首句的 one that 结构，将定义拆成若干必要条件。随后用必要条件筛选，缺少关键条件者立即排除；含 1500 AD 的选项只是区域实例，不能当作正确项。

  7. 第 7 段 定位词 naturalized harmless

    Why do ecologists caution against assuming that most naturalized exotic species are harmless?

    • A They have already destroyed and replaced most native species.
    • B They are all deliberately brought in by farmers.
    • C Their harmful effects may be undocumented, and they may become invasive only after decades.
    • D Their population size is always impossible to measure.
    • E They cannot fit into their new environments.
    • F They pose a greater threat than habitat loss from the moment they arrive.
    显示答案与解析 收起答案与解析

    正确答案：C

    正确项整合了 Yet 后的两个 caution：no one has documented their harmful effects，以及 appear harmless for decades, then turn invasive。障碍在于答案跨越两句，并将 may be considered acceptable 的认识偏差改写为 may be undocumented；考生需同时把握证据缺口和时间延迟。

    转折后抓警示依据 用 naturalized 与 harmless 双词扫描定位 第7段，略过开头的比例，直接从 Yet 开始读取 caution 的依据。将转折后的理由压缩成信息块，再选择能完整覆盖这些信息且保留 modal strength 的正确项。

STRUCTURE · 篇章结构

4 个意群的议论文骨架

按议论文 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. 引言 P1 P2

    外来物种治理的现状与争议

    这个 opening section 先呈现了 current practice，即 governments 和 private groups 每年投入 billions of dollars 来 root out 那些被认为 dangerous 的 non-native organisms，然后通过 "But" 这个 转折信号 immediately 引入了 scientists 的 questioning voice，他们 challenge 这个 assumption 说 alien species 的 presence 永远不能被 acceptable，并且指出把 introduced species 描绘成 inherently bad 是 unscientific approach

    这个 introductory unit 通过 presenting 一个 conventional practice 然后 immediately contrasting 它与 scientists' questioning，成功地 establish 了文章的 central tension，为后续 arguments 铺设了 foundation，让 readers 明白接下来会 explore 为什么 traditional view 是 oversimplified 的

    提出被质疑的传统观点
  2. 分论点 P3 P4

    区分标准的人为性论证

    这个 argumentative segment 通过 Dr. Rosenzweig 的 expert testimony 提出了一个 fundamental critique：区分 exotic 和 native species 的 distinctions 本质上是 artificial 的，因为它们 depend on 人为地 picking a date 然后把那个 date 之后出现的物种称为 exotic。第4段 进一步 reinforce 这个 argument，指出既然 can't roll back the clock，那么 both native and exotic species 都可能变成 invasive，所以都需要被 monitored and controlled

    这个 unit 为文章的 central claim 提供了 theoretical foundation，通过 attacking 分类系统的 arbitrariness 来 undermine 整个 "native good, exotic bad" 的 dichotomy。它 establishes 一个重要的 logical premise：如果 classification 本身是 artificial 的，那么 based on 这个 classification 的 blanket condemnation 就站不住脚

    论证分类标准的任意性
  3. 分论点 P5

    争议的核心与生态管理挑战

    这个 pivotal paragraph 用 "At its core" 这个 metadiscourse marker 明确 signal 文章进入 debate 的 central issue，即 how to manage 和 restore natural ecosystems。它 acknowledge 了 invasive species 确实能 cause harm（threaten biodiversity, harm ecosystems），这个 concession 展现了 balanced perspective，同时 contextualize 这个 threat 是 next to habitat loss 的 greatest threat，为后续 statistical argument 做铺垫

    这个 unit 起到 pivotal function，它通过 "At its core" 明确告诉 readers 文章的 real focus 不是 deny 外来物种的 potential harm，而是 shift 讨论到 management approach 的层面。这种 reframing 使文章的 argument 更 nuanced，避免了 simplistic 的 "外来物种无害" 的立场

    承认威胁但强调管理策略
  4. 分论点 P6 P7

    定义标准与统计证据

    这个 evidential unit 先在 第6段 clarify 了 alien species 的 definition（人为 carried 的物种，在 Americas 以 1500 AD 为 cutoff date），建立 clear parameters。然后 第7段 提供了 crucial statistical evidence：在美国的 7,000 alien species 中只有 10% 是 invasive，其余 90% 已经 fit into environments 并被 considered naturalized。但文章保持 critical nuance，通过 "Yet appearances can deceive" 和 "many... may be considered acceptable only because no one has documented their harmful effects" 来 caution against complacency

    这个 unit 为文章的 main argument 提供了 empirical foundation，通过 concrete statistics（10% invasive vs 90% naturalized）来 demonstrate 说 automatic rejection of all alien species 是 unjustified 的。同时它展现了 scientific rigor，通过 acknowledge uncertainties（appearances can deceive, decades before turning invasive）来 avoid overstating the case

    用数据反驳一刀切观点
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2018年6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. 识别被质疑的主流做法 P1

    议论文的 first paragraph 常常会 present 一个 widely-held belief 或 current practice，这为后面的 argument 提供 contrast。当你看到 governments and groups 正在大规模 doing something 时，要警觉作者可能会在后文 challenge 这个做法。

  2. 捕捉转折词后的质疑 P2

    在议论文中，第二段开头的 adversative conjunction（转折连词）like 'But', 'However', 'Yet' 是 critical signals，它们 mark 作者真正 position 的开始。当看到 'question the assumption' 这类 phrase，你就找到了文章的 core argument direction。

  3. 追踪多方证据的指向 P3 P4 P7

    在议论文中，当 multiple experts 用 strong language（如 'artificial', 'unscientific'）来 describe 某个 conventional view 时，这些 expert testimonies 是 reinforcing the main argument。你要 track 这些 supporting evidence 指向的 common direction。

  4. 验证结构与立场一致性 P1 P2 P3 P4 P5 P6 P7

    这个 three-step pattern（established view → explicit challenge → supporting evidence）是议论文 most reliable 的主旨识别 framework。当你能 quickly map 文章到这个 structure 时，主旨就非常 clear。

主旨信号词 question P2 But P2 artificial P3 unscientific P2 inherently P2

MAIN IDEA · 主旨

这篇文章在说什么

文章论证了将外来物种视为对生态系统固有有害的传统观点过于简化且不科学。文章提出这样的观点:本地物种和外来物种之间的区分是人为的,有效的生态系统管理应该关注监测所有物种的入侵性,而不是自动排斥非本地生物。
The article argues that the conventional view of alien species as inherently harmful to ecosystems is oversimplified and unscientific. It presents the perspective that distinctions between native and exotic species are artificial, and that effective ecosystem management should focus on monitoring all species' invasiveness rather than automatically rejecting non-native organisms.
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。已收录进英语六级高频真题词集的单词可点击进入词条页。

  • exotic 外来的、非本地的

    现在我们把三条 clues 串联起来：首先，exotic 和 alien 在文中 interchangeably used，建立了同义关系；其次，文章给出了 explicit definition，说 exotic species 是被人类 carried to new locations 的；最后，exotic 和 native 形成 antonymous pair，进一步确认了「外来」这个核心含义。三条线索 converge on the same conclusion，形成了完整的 reasoning chain。

    同义替换+显性定义+反义对比
  • invasive 入侵性的、扩张性的

    让我们整合所有 evidence：从 morphology 来看，invasive 源于 invade「侵入」；从 behavioral characteristics 来看，这类物种会 get out of hand，需要被 controlled；从 ecological impact 来看，它们 harm ecosystems、threaten biodiversity；从 statistical distribution 来看，它们是 alien species 中的 problematic minority。四条线索共同指向一个结论：invasive 描述的是那些 aggressively spreading、causing harm 的物种。

    构词+行为+影响+对比
  • biodiversity 生物多样性

    我们有两条 complementary clues:从 word structure 来看,bio + diversity 直接表达「生物多样性」;从 contextual logic 来看,当 native species 被 threatened 和 destroyed 时,biodiversity 就面临 threat,这证实了它指的就是 species variety 这个生态学概念。两条线索 perfectly align,推断非常 straightforward。

    构词拆解+语境验证
  • naturalize 归化的、已适应当地环境的

    三条线索形成完整推理:从 word formation 看,naturalize 是「使自然化」;从 parallel structure 看,它等同于 fit into environments;从 categorical contrast 看,它是 invasive 的 opposite,代表 harmless integration。所以 naturalized species 就是那些 successfully adapted、不再 foreign 的外来物种,已经 become part of the natural ecosystem。

    词源+句法+对比三角验证
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。

  • 引用论证

    P3 P4 P7

    文章通过引用 Dr. Michael Rosenzweig 和 Dr. Don Smith 这两位 evolutionary biology 和 ecology 领域的 professors 的观点，来支持 alien species 不应被一概而论为 harmful 的核心论点。这种 authority citation 增强了文章的 credibility 和 persuasiveness，因为这些 scientists 的专业背景直接关联到 ecosystems 和 species management 的研究领域。引用的内容包括对 native 和 exotic species 划分的质疑，以及关于 invasive species 比例的 statistical data，这些都为文章的 argument 提供了 solid foundation。

    信号词 said according to stated pointed out argued claimed noted observed suggested maintained asserted indicated

    仿写： 在写作 argumentative essay 时，当你要 challenge 一个 conventional view 或提出 controversial opinion，可以寻找该领域的 authoritative figures 来支持你的 standpoint。具体步骤：首先 identify 你需要支持的 key point，然后找到 relevant experts 的 direct quotes 或 paraphrased views，最后用 "according to"、"as stated by" 等 transitional phrases 引入。仿写模版：According to [Expert's Name], [Title/Position], [Expert's Viewpoint that supports your argument]. This perspective challenges the assumption that [Opposing View].

  • 对比论证

    P1 P2 P7

    文章在多处运用了 contrast 来突出 traditional view 和 new perspective 之间的 tension。最明显的对比出现在 第2段，通过 "But" 这个 adversative conjunction 引出 scientists 对 assumption 的 questioning，形成与 第1段 中 governments 和 individuals 花费 billions of dollars 去 root out non-native organisms 的 sharp contrast。这种 juxtaposition 让读者清晰看到两种 approaches 的根本差异：一方认为 alien species inherently bad，另一方认为这是 unscientific approach。此外，第7段 通过 statistics (10% invasive vs. 90% naturalized) 形成 quantitative contrast，有力地削弱了 all exotic species are harmful 的 stereotype。

    信号词 But However Yet Nevertheless On the contrary In contrast Conversely While Whereas Although Despite On the other hand

    仿写： 写作时，当你要 challenge 一个 prevailing view 或 present 一个 alternative perspective，可以先 present the traditional view，然后用 adversative conjunctions (but, however, yet) 引出你的 contrasting position。具体技巧：使用 parallel structure 让对比更 striking，比如 "While X believes..., Y argues..."。也可以用 statistics 来形成 quantitative contrast，比如 "Only X percent... while Y percent..."。仿写模版：[Group A] spend/believe/argue [Position 1]. But/However, [Group B] question/challenge this assumption, arguing that [Contrasting Position 2]. This contrast reveals that [Your Insight].

  • 举例论证

    P6 P7

    文章在 第6段 和 第7段 中使用了 concrete examples 来支持其 arguments。第6段 以 1500 AD 作为 dividing line 的 specific example，说明 exotic species 的定义依赖于 arbitrary date selection，这直接支持了 第3段 中 Rosenzweig 关于 distinctions between exotic and native species are artificial 的观点。第7段 提供了 statistical example：在美国的 150,000 species 中，有 7,000 alien species，其中只有约 10% 是 invasive，而 90% 已经 naturalized。这个 concrete data example 有力地证明了不是所有 alien species 都 problematic，让 abstract argument 变得 tangible and convincing。

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

    仿写： 在构建 argumentative essay 时，每当你提出一个 general claim 或 abstract concept，问自己：我能用什么 specific example 来 illustrate this？选择 examples 时要考虑 relevance (与论点直接相关)、representativeness (具有代表性) 和 persuasiveness (说服力强)。可以使用 numerical data、historical events 或 specific cases。引入 examples 时使用明确的 signal phrases。仿写模版：[General Claim]. For example/instance, [Specific Example with details]. This example demonstrates/illustrates that [Connection back to main argument].

  • 因果论证

    P5

    文章在 第5段 中展现了 causal reasoning，解释为什么 invasive species 是一个需要关注的 issue。文章先指出 species that invade a territory 的 effects (harm ecosystems, agriculture, human health)，然后说明 consequences (threaten or destroy native species)，最后给出 causal conclusion："Next to habitat loss, these invasive species represent the greatest threat to biodiversity"。这个 causal chain (invasive species → harm ecosystems → threaten biodiversity) 建立了 logical connection，解释了为什么这个 debate matters。虽然文章 overall 是要 challenge the automatic rejection of alien species，但这段的 causal analysis 也承认了 genuine concern 的存在，展现了 balanced argumentation。

    信号词 because since as a result consequently therefore thus leads to causes results in due to owing to as a consequence for this reason

    仿写： 构建 causal argument 时，需要清晰地 establish the link between cause and effect。可以使用 single-cause single-effect (A causes B) 或 causal chain (A causes B, which causes C)。关键是提供 sufficient evidence 或 logical reasoning 来 support the causal link。避免 post hoc fallacy (仅因时间先后就认为有因果关系)。使用明确的 causal language 来 guide readers。仿写模版：[Action/Phenomenon A] can [Effect B]. [Further elaboration of mechanism]. As a result/Consequently, [Ultimate Outcome C]. This [causal relationship] shows/demonstrates that [Implication for your argument].

  • 比喻修辞

    P4

    文章在 第4段 中使用了 metaphorical expression "roll back the clock"，这是一个 vivid metaphor，将 time 比作可以 physically manipulate 的 mechanism。这个 metaphor 形象地表达了一个 abstract idea：我们无法 reverse history 或 return to a previous ecological state。这个 figurative language 比直接说 "reverse the past" 或 "undo historical changes" 更有 impact 和 memorability。它强化了文章的核心观点：与其试图 restore 一个 idealized past state，不如 manage current reality。这种 metaphor 让 abstract temporal concept 变得 concrete and tangible，增强了 persuasive effect。

    仿写： 使用 metaphors 时，选择你的 target audience 熟悉的 source domain (比如日常 physical objects、actions)，用它来 illuminate 你要表达的 abstract target domain。确保 metaphor 的 mapping 是 coherent 的：source domain 的 characteristics 要能 meaningfully correspond to target domain。避免 mixed metaphors (混杂不同的比喻)。在 formal academic writing 中，metaphors 应该 serve argumentation，而不是纯粹 decorative。仿写模版：[Use a concrete action/object] to represent [abstract concept]. 例如：We cannot [concrete physical action like 'roll back the clock'] and [abstract desired outcome]. 或：[Abstract concept] is [concrete object/phenomenon]。

IMPLIED MEANING · 言外之意

16 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。

  • 主流治理建立在预设危险上

    P1
    non-native organisms that are considered dangerous to ecosystems

    委婉表达 considered dangerous considered seen as regarded as viewed as portrayed as treated as

    这里暗示政府和公众投入巨资的前提，是把 non-native organisms 预先界定为危险对象，而这一前提尚未被证明为绝对真理。它为第二段 scientists question the assumption 埋下伏笔，使全文从“如何消灭外来物种”转向“这种消灭逻辑是否合理”的 debate。

  • 治理规模不等于判断正确

    P1
    spend billions of dollars a year

    数量强调 billions of dollars millions vast enormous huge large-scale massive

    billions of dollars 暗示这不是边缘性的学术争论，而是影响公共财政和生态政策的重大问题。作者先展示既有政策的 massive investment，后文再质疑其基础假设，从而提高重新审视 alien species 观念的现实价值。

  • 主流观点遭到科学挑战

    P2
    But a number of scientists question the assumption

    转折类 But but however yet nevertheless nonetheless instead

    But 暗示“外来物种必然有害”虽是流行政策逻辑，却并非没有争议。它直接启动全文的核心 conflict，即传统 ecological view 与较为审慎的新观点之间的冲突。

  • 物种来源不等于生态危害

    P2
    introduced species as inherently bad is an unscientific approach

    绝对化表达 inherently bad inherently always never all every necessarily

    inherently bad 被判为 unscientific，暗示危害性不是由“是否外来”这一身份自动决定，而取决于具体行为和环境。这个判断构成文章主旨的理论核心，即反对把 alien species 标签直接等同于 ecological threat。

  • 本土与外来是人为标签

    P3
    Distinctions between exotic and native species are artificial

    评价性用词 artificial arbitrary biased misleading problematic questionable subjective

    artificial 暗示 exotic 与 native 并非自然界中绝对、永恒的二分，而是人类根据历史时间点建立的 labels。它削弱了“外来者天然不自然”的道德化想象，并为按实际 invasiveness 管理物种提供逻辑基础。

  • 自然标准依赖任意时间线

    P3
    they depend on picking a date and calling the plants and animals that show up after that date exotic

    具体化举例 picking a date for example such as in this case defined by based on according to

    picking a date 暗示只要时间分界线改变，同一种植物或动物的身份也可能改变，因此“外来”并不自动说明它生态上有罪。该细节把前句 artificial 的抽象批评落到可验证的定义问题上，增强了论证的 persuasive force。

  • 所谓自然带有默认偏见

    P3
    are, by default, considered the most natural

    委婉表达 by default automatically as a matter of course presumably by definition without question taken for granted

    by default 暗示“没有外来物种的生态系统最自然”并不是观察后的必然结论，而是分类规则自动赋予的优越地位。它进一步说明传统 native-centered view 可能含有概念偏见，而不完全是科学事实。

  • 全面复原过去并不现实

    P4
    You can't roll back the clock and remove all exotics or fix habitats

    比喻表达 can't roll back the clock roll back the clock turn back the clock open the door to tip the balance a double-edged sword a slippery slope

    这句话暗示生态系统已经被长期的人类迁移和环境破坏改变，企图恢复某个纯粹历史状态是不现实的 ideal. 它把讨论从“应不应该彻底清除”推进到“现实中怎样有效管理”，使文章立场更具 practicality。

  • 风险关键在失控而非出身

    P4
    Both native and exotic species can become invasive

    对比类 Both native and exotic both A and B rather than not A but B instead of whether A or B alike

    Both native and exotic 暗示 native species 也并非天然安全，exotic species 也并非必然失控，因此来源不能充当唯一风险标准。它明确提出全文隐含的管理原则：应监测所有开始 get out of hand 的物种，而非仅因其外来身份排斥它们。

  • 争论实为资源管理选择

    P5
    At its core, the debate is about how to manage the world's remaining natural ecosystems

    强调类 At its core at its core in fact indeed the key is what matters is fundamentally

    At its core 暗示物种命名之争并不只是学术术语之争，它最终关系到生态修复、保护优先级和资源分配等 real-world decisions。该句把全文提升到 ecosystem management 层面，防止读者把文章误读成单纯替外来物种辩护。

  • 危害论仍是重要现实

    P5
    these invasive species represent the greatest threat to biodiversity worldwide, many ecologists say

    模糊限制语 many ecologists say many some generally often usually may

    这句话并未否认 invasive species 的严重危害，反而承认它们在 biodiversity 问题中极其重要，只是把判断归于 many ecologists 而非绝对事实。其作用是形成 concession：文章反对的是“所有外来物种皆坏”的过度推论，不是否认真正入侵物种的 threat。

  • 生态定义具有历史约定性

    P6
    That date, rounded off to 1500 AD

    模糊限制语 rounded off to 1500 AD rounded off about approximately roughly around more or less

    rounded off to 1500 AD 暗示 1500 年只是为了分类方便而采用的 historical benchmark，并非自然界发生了绝对断裂。它具体印证第三段的 artificial distinction，同时也表明 ecologists 的定义仍有管理和研究上的 practical purpose。

  • 外来不必然导致入侵

    P7
    Only a small percentage of alien species cause problems in their new habitats

    数量限制 Only a small percentage only a small percentage few a minority a handful of limited

    Only a small percentage 暗示绝大多数 alien species 并未造成可见问题，因此以“外来”身份实施一刀切控制可能效率不高。该统计材料为文章的反标签化立场提供了 quantitative support，并引出 naturalized 这一更复杂的中间状态。

  • 无害表象未必可靠

    P7
    Yet appearances can deceive

    转折类 Yet appearances can deceive yet but however appearances can deceive seemingly at first glance

    Yet 表明作者没有让 10 percent 的数据滑向盲目乐观，表面 harmless 不代表已经被充分验证为无害。它使文章形成双向修正：既反对全面妖魔化 exotics，也反对因暂时无害而放松监测。

  • 缺少记录不等于没有伤害

    P7
    many of these exotics may be considered acceptable only because no one has documented their harmful effects

    情态词与限定表达 may be considered acceptable only because may might could only because no evidence of has not been documented

    该句暗示部分物种之所以被称为 acceptable，可能只是研究、监测或记录尚不充分，而不是其 harmful effects 确实不存在。它为谨慎监控提供 epistemic reason，使文章的立场保持科学审慎而非简单宽容。

  • 生态风险可能长期潜伏

    P7
    non-native species can appear harmless for decades, then turn invasive

    时间对比 can appear harmless for decades, then turn invasive for decades, then eventually over time later suddenly at first

    for decades, then turn invasive 暗示物种危害具有延迟性，今天的 harmless status 不能保证未来安全。它与第四段 monitor and control 相呼应，最终支持文章最平衡的结论：不应按 origin 一概排斥，但必须持续评估实际 invasiveness。

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（ Questioning and Nuanced）。下面是按步骤还原的判断过程与文中的态度信号词。

  1. 首段呈现现象不表态 P1

    Argumentative essays 的 opening 往往会 establish context，如果作者在第一段就用 strong evaluative language，那态度会很 clear。但这里作者只是 state a fact，说明他可能要 present multiple perspectives，这是 neutral tone 的 signal。

  2. 转折词引入对立观点 P2

    "But" 的出现表明作者要 introduce 一个 contrasting viewpoint，而用 "a number of scientists" 这种 attribution 说明作者在 objectively report 学术界的 different voices。如果作者 strongly support 某一方，他会用 "fortunately" 或 "unfortunately" 这类 evaluative adverbs。

  3. 段落分配体现平衡性 P2 P3 P4 P5 P6 P7

    如果作者 favor 某一方，paragraph distribution 会 skewed。这里作者给 questioning scientists 和 traditional ecologists 都分配了 substantial space，还引用了 specific experts 和 concrete data（如 7,000 alien species 中只有 10% invasive）。这种 even-handed treatment 是 neutral stance 的 strong indicator。

  4. 结尾保留复杂性 P7

    Strong opinionated writers 会在 conclusion 给出 clear verdict，但这里作者用 cautionary language 来 complicate 看似 reassuring 的 data（90% naturalized species）。"Yet" 和 "can deceive" 这类 hedging expressions 说明作者 resist simplistic answers，这是 objective analytical tone 的 key feature。

  5. 综合信号显中立探究 P1 P2 P3 P4 P5 P6 P7

    这种 presentation style 说明作者 recognize 这是一个 ongoing scientific debate with valid points on both sides。没有 emotional language、没有 clear conclusion、balance structure、extensive attribution to experts——这些都是 questioning and nuanced attitude 的 markers，而非 supportive 或 critical stance。

文中的态度信号词

  • But P2

    "But" 在 第2段 开头 introduce 了 contrasting perspective，它 signal 作者要 present 一个 different viewpoint from 第1段 的 mainstream practice。这个 strong contrastive marker 说明作者不是 simply endorsing 第一段的 approach，而是要 explore alternative views，这是 balanced reporting 的 key signal。

    同类词 However Yet Nevertheless On the other hand In contrast

  • question the assumption P2

    "Question the assumption" 是 epistemically tentative language，它表明作者在 report 一种 intellectual inquiry 而非 asserting truth。用 "question" 而非 "prove wrong" 或 "debunk" 说明作者 respect 这种 skeptical stance 但不 necessarily endorse it fully，这是 neutral academic tone 的体现。

    同类词 question challenge debate dispute reconsider

  • said P3

    "Said" 是最 neutral 的 reporting verb，作者用它来 attribute Dr. Rosenzweig 的 views 说明他在 objectively present 这位 expert 的 perspective without adding evaluative coloring。如果作者用 "claimed" 或 "insisted"，会 imply skepticism；用 "wisely noted" 会 show approval。"Said" 保持了 reportorial distance。

    同类词 stated noted pointed out observed remarked

  • artificial P3

    "Artificial" 是 Dr. Rosenzweig 用来 characterize 现有 distinction between exotic and native species 的词，它 implies 这种 distinction 是 human construct 而非 natural fact。作者 directly quote 这个词说明他在 faithfully report 这种 questioning perspective，同时也 allow readers 去 evaluate 这个 claim 的 validity。

    同类词 arbitrary subjective constructed man-made conventional

  • can never be acceptable P2

    "Can never be acceptable" 是作者 characterize 被 questioned 的 assumption 时用的 absolute language。这种 extreme phrasing（never、inherently bad）在被 presented as the view to be questioned，说明作者在 highlight 这种 absolutism 可能是 problematic 的。但作者没有直接说它 wrong，而是说 scientists question it，保持了 analytical distance。

    同类词 never always inherently inevitably absolutely

  • At its core P5

    "At its core" 是作者用来 introduce central framing 的 meta-discourse marker。它 signal 作者在 step back 来 articulate what the debate is fundamentally about。这种 framing language 说明作者在 analyzing the debate structure 而非 participating as an advocate，他的 role 是 clarify the stakes 而非 settle the dispute。

    同类词 Fundamentally Essentially At the heart of The crux of Ultimately

  • many ecologists say P5

    "Many ecologists say" 再次体现 attribution strategy，作者把 "invasive species represent the greatest threat to biodiversity" 这个 strong claim 归给 "many ecologists" 而非 present it as uncontested fact。这种 consistent attribution of different views 说明作者在 maintain reportorial stance throughout。

    同类词 some argue others contend critics maintain proponents believe experts suggest

  • yet appearances can deceive P7

    "Yet appearances can deceive" 是作者用来 complicate 前面 seemingly reassuring data（90% naturalized）的 cautionary phrase。"Yet" signal 这不是 simple good news，"can deceive" introduce uncertainty。这种 qualifying move 说明作者 resist easy conclusions，他在 remind readers of complexity 而非 push toward comfort or alarm。

    同类词 yet however but though although

GENRE · 速判体裁

30 秒判定这是一篇议论文

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议论文？

  1. 寻找对立观点标记词 P2 P3

    第2段 里明确出现了 'But a number of scientists question the assumption'，这个 'question' 和 'but' 就是典型的 opposing view marker，说明文只会 present facts objectively，新闻报道也不会如此直接地 highlight the debate itself

  2. 识别核心争议问题 P5

    第5段 直接说 'At its core, the debate is about...'，这个 'debate' 一词就是 explicit indicator，说明文会说 'the phenomenon is about'，新闻报道会说 'the event is about'，只有议论文会强调 'the debate is about'

  3. 检查论证推理结构 P1 P2 P3 P4 P7

    第1段 提到 governments spend billions trying to root out non-native organisms，然后 第2段-4 马上给出 scientists 的 opposing reasoning，这种 'fact + counterargument' 的 structure 是议论文特有的，说明文只会 explain the fact，新闻报道会 report what happened 但不会深入 explore the reasoning behind opposing views

  4. 三角定位争议要素 P1 P2 P3 P4 P5 P6 P7

    这篇文章通过 第1段 的 mainstream practice，第2段-4 的 opposing scientific view，第5段 的 explicit debate statement，以及 第6段-7 的 nuanced discussion，完整呈现了 alien species management 这个 controversial issue 的 multiple dimensions，这正是议论文的 defining characteristic，而说明文只会 explain how ecosystems work，新闻报道只会 report what actions were taken

哪些词暴露了议论文体裁？

  • question the assumption P2 观点质疑词 challenge the view dispute the claim cast doubt on raise concerns about take issue with
  • unscientific approach P2 立场评判词 flawed reasoning misguided policy problematic assumption oversimplified view unjustified conclusion
  • said Dr. Michael Rosenzweig P3 观点引导词 said argued claimed contended asserted
  • But P2 论证逻辑连接词 However Nevertheless On the contrary In contrast Yet
  • At its core, the debate is about P5 论证逻辑连接词 The central issue is The fundamental question is At the heart of the matter The crux of the argument The key controversy concerns
  • many ecologists say P5 观点引导词 experts argue critics contend proponents claim opponents maintain some researchers suggest
  • Yet appearances can deceive P7 论证逻辑连接词 However, this overlooks But this ignores Nevertheless, one must consider Still, it is important to note Even so, we should recognize
SENTENCE INSIGHTS · 句子精讲

4 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 2018年6月英语六级真题第2套 Part II Section C (1) 的常见问题

2018年6月英语六级真题第2套 Part II Section C (1) 文章的主旨是什么？
2018年6月英语六级真题第2套 Part II Section C (1) 文章论证了将外来物种视为对生态系统固有有害的传统观点过于简化且不科学。文章提出这样的观点:本地物种和外来物种之间的区分是人为的,有效的生态系统管理应该关注监测所有物种的入侵性,而不是自动排斥非本地生物。（英文表述：The article argues that the conventional view of alien species as inherently harmful to ecosystems is oversimplified and unscientific. It presents the perspective that distinctions between native and exotic species are artificial, and that effective ecosystem management should focus on monitoring all species' invasiveness rather than automatically rejecting non-native organisms.）
2018年6月英语六级真题第2套 Part II Section C (1) 文章是什么体裁？难度如何？
体裁为议论文，作者立场是客观中立（Questioning and Nuanced）。CEFR 难度 C1，全文 399 词、7 段；在英语六级全部 593 篇真题文章中，C1 级共 343 篇（占 58%）。
2018年6月英语六级真题第2套 Part II Section C (1) 文章的篇章结构是怎样的？
全文 7 段按议论文骨架分为 4 个意群：引言 · 第1段、第2段——外来物种治理的现状与争议；分论点 · 第3段、第4段——区分标准的人为性论证；分论点 · 第5段——争议的核心与生态管理挑战；分论点 · 第6段、第7段——定义标准与统计证据。
2018年6月英语六级真题第2套 Part II Section C (1) 文章的作者态度是什么？
作者态度是客观中立（Questioning and Nuanced）。判断路径：首段呈现现象不表态 → 转折词引入对立观点 → 段落分配体现平衡性 → 结尾保留复杂性 → 综合信号显中立探究；文中的态度信号词包括 But（第2段）、question the assumption（第2段）、said（第3段）、artificial（第3段）、can never be acceptable（第2段）、At its core（第5段）、many ecologists say（第5段）、yet appearances can deceive（第7段）。
2018年6月英语六级真题第2套 Part II Section C (1) 文章中有哪些值得积累的生词？
按文中出现顺序共 4 个：exotic（外来的、非本地的）、invasive（入侵性的、扩张性的）、biodiversity（生物多样性）、naturalize（归化的、已适应当地环境的），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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