2018年6月英语四级真题第1套 Part III Section C (1)

作者通过 concrete examples 来clarify抽象概念。比如在第4段里提到forgetting an actor's name versus forgetting the entire plot，这个contrast鲜明的例子让readers immediately understand正常memory slip和dementia symptom之间的difference。第5段继续用microwave oven和driving to a friend's house这些daily scenarios作为examples，让warning signs变得tangible and recognizable。这些examples的作用是把medical concepts转化成relatable situations，帮助target audience（考生和普通读者）进行self-assessment。

信号词 for example for instance such as like including say take... for example

仿写： 当你写explanatory essay时，问自己：这个concept对reader来说是否too abstract？然后deliberately choose examples that are universally relatable。模版可以是："For example, [具体场景A] is [正常情况], but if [具体场景B], that's [需要关注的情况]。"比如explaining procrastination时可以写："Delaying a task for a few hours is normal, but if you consistently miss important deadlines, that's a sign of deeper issues."记住examples要具有representativeness和contrast。

第5段里的"that's a red flag that something more serious may be involved"是典型的interpretive explanation。作者不只是describe现象，而是explain its significance。Red flag这个metaphor被immediately interpreted为"something more serious"，给readers提供了clear guidance on how to interpret certain symptoms。这种诠释directly serves文章主旨中的"identifies warning signs requiring medical attention"部分，帮助readers understand when to be concerned。

信号词 that is in other words that means which means suggests indicates implies

仿写： 使用作诠释时，identify哪些terms或concepts可能cause confusion，然后provide immediate clarification。模版结构："[现象/术语], [连接词indicating explanation], [更易理解的解释]。"比如："Cognitive reserve, in other words, is your brain's ability to withstand damage."或者"This symptom suggests, that is to say, a more systemic problem."关键是让clarification feel natural而不是redundant。

第2段明确提到"After age 50"这个specific number，给information增加了precision和credibility。它helps readers identify at what point certain changes become common，directly supporting文章主旨中关于"age-related memory loss"的discussion。数字让abstract concept of "aging"变得measurable and concrete。

信号词 after age approximately about around over more than percent number rate

仿写： 在explanatory writing中strategically place numbers来establish credibility和provide context。问自己：What threshold、percentage或timeframe would help readers understand this better？模版："After [数字+时间单位], [现象] becomes [形容词]."或"Approximately [数字+百分比] of [群体] experience [情况]."但avoid overloading with numbers；select the most meaningful ones that directly support your main points。

整篇文章的structural backbone就是continuous comparison between normal age-related memory loss和dementia symptoms。第1段明确指出"pretty clear differences"，第4段的"forgetting actor's name versus forgetting plot"是explicit contrast，第5段的"forgetting how to operate familiar objects"versus日常小遗忘也是对比。这个pervasive comparison strategy directly serves文章的core purpose：帮助readers distinguish between两种conditions，从而know when to seek medical attention。

信号词 but however while whereas in contrast on the other hand compared to versus unlike different from

仿写： 建立meaningful comparisons时，ensure两个items have enough common ground to make comparison relevant，同时有enough distinction to make it informative。使用parallel structure来emphasize contrast："[情况A] is [特征1], but/while [情况B] is [特征2]."比如："Feeling nervous before a presentation is normal, but experiencing panic attacks regularly suggests an anxiety disorder."可以用contrastive conjunctions（but、while、whereas、however）来signal comparison，也可以用comparative structures（more...than、less...than）来show degree。

第3段整段都是对brain aging process的detailed interpretation。"The brain ages just like the rest of the body"这个opening statement后面紧跟着specific mechanisms：certain parts shrink、communication affects、blood flow reduces。这不仅是description，更是explanation of why memory changes occur。这个biological interpretation为later paragraphs about symptoms提供了scientific foundation，让readers understand the underlying causes而不只是surface phenomena。

信号词 specifically in particular namely that is to say this means as a result because due to

仿写： 当explaining complex processes时，use a "general-to-specific"的interpretive structure。Start with a relatable comparison或overview statement，然后break down into specific components。模版："[现象] works like [类比]. Specifically, [具体机制1]. Additionally, [具体机制2]. As a result, [结果]."比如："Muscle atrophy occurs similar to unused skills. Specifically, protein breakdown exceeds synthesis. Additionally, nerve connections weaken. As a result, strength diminishes."每个explanatory layer should add clarity without overwhelming readers。

文章multiple times引用Dr. Kirk Daffner这位authority from Brigham and Women's Hospital。"says Dr. Kirk Daffner"和"Daffner says"这些attribution phrases出现在第2段、第4段、第5段、第6段、第7段和第8段。引用medical expert不仅增强了credibility，也让advice carry more weight。这个strategy directly supports文章主旨中的"recommends strategies"部分，因为recommendations来自recognized authority而不是anonymous source。

信号词 says according to notes suggests explains states reports 研究表明 专家指出 claims

仿写： 引用sources时，always provide context about source's credibility（比如institutional affiliation或expertise area）。模版："According to [专家名+职位/机构], [观点/建议]."或"[专家名] from [机构] notes that [陈述]."比如："Dr. Sarah Johnson from Stanford Sleep Research Center notes that consistent sleep schedules improve memory consolidation."Vary your attribution verbs（says、suggests、explains、notes、recommends）来avoid repetition。记住balance direct quotes和paraphrased information。

第6段列举了multiple categories of factors that can cause confusion和memory loss：health problems（包括sleep apnea、high blood pressure、depression）和medications（如antidepressants）。这个categorization helps readers understand that memory issues并非automatically indicate dementia，而可能stem from various treatable conditions。这种分类directly supports文章主旨中的"people shouldn't panic"message，提供了alternative explanations for symptoms。

信号词 including such as like types of categories can be divided into fall into range from...to both...and

仿写： 创建categories时，ensure它们mutually exclusive且collectively exhaustive（尽可能）。使用clear organizational signals："There are several types/causes/factors: [类别1], [类别2], and [类别3]."或"[现象] can result from [类别A], including [例子], as well as [类别B] like [例子]."比如："Academic struggles can stem from cognitive factors like learning disabilities, environmental factors such as poor study conditions, and emotional factors including anxiety."每个category应该有examples或elaboration来clarify boundaries。