2016年6月英语四级真题第1套 Part II Section C (1)

文章通过 precise numerical data 来 establish credibility。First，提到 40% of Americans 睡眠不足 seven hours，这个 specific percentage 让 sleep deprivation 的 prevalence 变得 tangible。Second，对比 1950s 的 eight hours 和 recent years 的 seven hours，这个 temporal comparison with numbers 直观展示了 sleep duration 的 decline trend。这些 concrete figures 不是 arbitrary 的，而是让 abstract health issue 变成 quantifiable reality，强化了文章关于 sleep crisis 的 main argument，给 readers 一种 urgency 和 scientific authority。

信号词 40% seven hours eight hours 1950s some approximately over less than more than doubled tripled declined from...to

仿写： 当你想 demonstrate 一个 trend 或 problem 的 severity 时，ask yourself: 能否找到 concrete statistics 来 replace general statements？比如不说"很多人"，而说"approximately 40% of the population"。Think about temporal comparisons：对比 different time periods 的 numbers 能 highlight changes。模版可以是：'Some [percentage] of [group] [verb phrase]. For example, [specific metric] has [increased/decreased] from [number] in [time period] to [number] in [current period].' 这样的 structure 既有 overview statistics，又有 detailed historical data，让你的 argument 既 broad 又 specific。

文章用 'For example' 明确引出 specific instances 来 support general claims。在 第2段 里，先 establish 了 sleep 和 health 的 link 变得 clearer，然后举例：sleep duration decline 伴随着 high blood pressure increase。这个 concrete example 把 abstract correlation 变成 observable pattern。再举例 blood pressure 和 heart rate 在 sleep 时 lowest，sleep-deprived people 会有 higher blood pressure、heart attack 等 problems。这些 specific health conditions 作为 examples，让 'bad sleep and disease' 的 vague statement 变得 具体可感。Examples serve as evidence，把 theoretical connection 转化为 real-world consequences，强化 article 的 persuasive力 和 practical relevance。

信号词 For example for instance such as including like namely specifically in particular take...for example consider as illustrated by

仿写： When making a broad claim，immediately think: 能否给出 one or two specific instances？Structure 可以是先 state the general point，然后用 'For example' 或 'For instance' 来 introduce specifics。Think about different types of examples: temporal (historical cases)，categorical (different types)，或 causal (cause-effect instances)。模版：'[General statement about relationship/trend]. For example, [specific case A] demonstrates this by [specific detail]. Additionally, [specific case B] shows [another specific detail].' 关键是 examples 要 directly support your main point，而不是 tangential information。

文章 strategically quotes experts 来 establish authority。Lawrence Epstein (Harvard sleep expert) 的 quote 'The link between sleep and health...is becoming clearer and clearer' 提供了 academic endorsement。Doctor Felice (Northwestern University) 的 explanation about stress hormones 和 immune function 给出了 physiological mechanism。还提到 University of Chicago study 关于 sleep 和 longevity 的 finding。这些 citations 不是 decorative，而是 把 article's claims 建立在 scientific research 和 expert opinion 的 foundation 上。By referencing prestigious institutions (Harvard, Northwestern, University of Chicago)，文章 enhances its credibility，让 argument 从 journalist's opinion 升级为 scientifically-backed facts。这对 persuade readers 关于 sleep importance 至关重要。

信号词 says according to states explains points out notes argues research shows study shows evidence from experts suggest as [name] puts it in the words of

仿写： When presenting a claim that requires expert validation，ask: 谁是这个 field 的 authority？Look for opportunities to integrate expert voices，但要 strategic：quote when the expert's exact words add value，paraphrase when you need flexibility。Structure 建议：'According to [Name], [title/affiliation], "[direct quote]."' 或者 'Research from [institution] shows that [paraphrased finding].' 模版：'[Your claim]. [Expert name], a [credential] at [institution], explains that "[quote supporting your claim]."' 记得 balance：不要 over-rely on quotes (让文章变成 quote collection)，也不要 under-cite (缺乏 authority)。Select sources that readers will recognize as credible。

文章通过 temporal comparison 来 dramatize change。第2段 explicitly contrasts 1950s 的 eight-hour sleep 和 recent years 的 seven-hour sleep，这个 before-and-after comparison 让 sleep decline 从 abstract trend 变成 measurable deterioration。同时 juxtapose 了这个 decline 和 high blood pressure 的 increase，creating a parallel structure that suggests causation。这种 comparison 不只是 presenting two data points，而是 构建了 historical narrative：things were better, now they're worse, and here's the consequence。Through contrast，文章 amplifies the urgency of the problem，因为 readers can see the trajectory 和 its health implications side by side。这让 main argument 关于 sleep priority 变得更 compelling。

信号词 from...to at the same time in contrast on the other hand while whereas compared to in comparison similarly likewise unlike rather than instead of

仿写： 识别什么 aspects 值得 compare。对于 temporal changes，ask: 过去是什么样，现在是什么样？对于 cause-effect relationships，consider: 有 X 和没有 X 的 difference 是什么？Structure 建议：establish baseline first，然后 present contrasting case。模版：'[Metric] [verb] from [value/state A] in [time/condition 1] to [value/state B] in [time/condition 2]. At the same time, [related phenomenon] has [increased/decreased/changed].' 使用 transitional phrases like 'in contrast', 'on the other hand', 'while...', 'at the same time' 来 signal comparative relationships。Key 是 make sure your comparison serves a purpose，不是 just listing differences，而是 using contrast to prove a point。

文章多次 explain mechanisms behind observations。在 第3段，Doctor Felice 不只说 sleep deprivation 影响 immunity，而是 elaborate the pathway：'there are higher levels of stress hormones in their bodies, which can decrease immune function.' 这个 explanation 把 cause (sleep deprivation) 和 effect (weakened immunity) 连接起来，through intermediate step (stress hormones)。同样，第2段 解释为什么 sleep 重要：'Blood pressure and heart rate are typically at their lowest levels during sleep'，然后 interpret the implication：less sleep → higher blood pressure. 这些 interpretations 不是 simple restatements，而是 unpacking the logic，giving readers the 'why' behind the 'what'。这种 elucidation 让 article 从 merely informative 变成 truly educational，helping readers understand causal relationships 而不是 just memorize facts。

信号词 which can which means this is because in other words that is to say meaning that suggesting that implying that this explains why the reason is as a result

仿写： After stating a fact or claim，ask yourself: 读者理解 the mechanism 了吗？If not, add explanatory layer。Look for opportunities to insert 'which means', 'in other words', 'this is because' to signal interpretation。Structure 可以是：[Phenomenon/fact] + [interpretive clause explaining why/how]. 模版：'[Observation]. This happens because [underlying mechanism]. [Further elaboration of the implication].' 或者 'When [condition A], [consequence B] occurs, which [explains the broader significance].' 关键是 add analytical depth，不是 just restating in different words，而是 revealing the logic chain that connects ideas。Think causally: what's the mechanism? What's the intermediate step? Why does this matter?