TOEFL 托福 听力原创模拟题 6

NARRATOR: Listen to a conversation between a student and a professor. STUDENT: Hi, Professor. Thanks for meeting with me during your office hours. I, um, wanted to talk about our upcoming term paper for the Environmental Studies course. PROFESSOR: Of course, Diego. Come on in. I am always glad to help. How is the topic selection going? Have you decided what you want to write about? STUDENT: Well, that is the problem. I am feeling, um, a bit overwhelmed. I have two ideas, but I am not sure if either one is right. My first idea was air... wait, actually, my first idea was to write about global water pollution. I wanted to look at how different oceans are being polluted. PROFESSOR: Ah, global water pollution is a very important issue. But remember, this term paper has a strict five-page limit. If you try to cover the entire world's water pollution in five pages, you will only be able to touch the surface. You won't be able to provide any deep analysis. STUDENT: Right, I see what you mean. My other idea was to write about the history of solar panels, you know, how they have become more efficient over the last fifty years. PROFESSOR: Again, fifty years of technology is a lot of history to squeeze into a short paper. Let's look at your first idea. Instead of global water pollution, could we narrow it down? What if you looked at a specific local project? STUDENT: Oh! Like the campus wetlands restoration project? I read an article about how our university cleaned up the marsh area near the athletic fields to help filter rainwater naturally. PROFESSOR: Exactly! That is a perfect fit. It is local, there are documents available in the campus library, and it perfectly illustrates the concept of biological filtration we discussed in class last week. STUDENT: That sounds much easier to manage. I can actually write a detailed five-page paper on that without getting lost. PROFESSOR: I agree. Now, remember the deadline. The final paper is due next Friday at five p.m. to our online portal. But before you write the whole thing, I want you to email me a one-paragraph outline of your main points. STUDENT: Can I send that outline by Wednesday? PROFESSOR: Wednesday is perfect. That gives me time to look it over and give you some feedback before you do the heavy writing. STUDENT: Great. Thank you so much, Professor. This really helped clear things up! [Q1] Why does the student go to see the professor?

中文翻译

旁白：听一段学生和教授之间的对话。 学生：您好，教授。感谢您在答疑时间抽空见我。那个，我想谈谈我们即将交的《环境研究》课程期末论文。 教授：当然可以，迪亚戈。快进来。我很乐意帮忙。选题进展得怎么样了？你决定好写什么了吗？ 学生：呃，问题就在这儿。我觉得有点不知所措。我有两个想法，但不确定哪一个合适。我的第一个想法是空气……等等，其实，我的第一个想法是写全球水污染。我想研究不同的海洋是如何受到污染的。 教授：啊，全球水污染是一个非常重要的议题。但要记住，这篇期末论文有严格的五页纸限制。如果你想在五页纸里写完整个世界的水污染，你只能蜻蜓点水，无法进行任何深入的分析。 学生：对，我明白您的意思。我的另一个想法是写太阳能电池板的历史，就是它们在过去五十年里是如何变得更加高效的。 教授：同样，要把五十年的技术发展史压缩进一篇短论文里，内容实在太多了。我们来看看你的第一个想法。如果不写全球水污染，我们能不能缩小范围？比如，研究一个具体的本地项目怎么样？ 学生：哦！就像校园湿地修复项目？我读过一篇文章，讲的是我们学校如何清理体育场附近的沼泽区，以帮助自然过滤雨水。 教授：没错！这非常合适。它既是本地项目，学校图书馆又有相关文献，而且完美地阐释了我们上周课上讨论的生物过滤概念。 学生：这听起来容易操作多了。这样我确实能写出一篇详尽的五页纸论文，而不会理不清头绪。 教授：我同意。现在，记住截止日期。期末论文须在下周五下午五点前提交到我们的在线系统。但在你动笔写整篇论文之前，我希望你先给我发一封邮件，里面写一段关于你主要观点的提纲。 学生：我能在周三前把提纲发给您吗？ 教授：周三太棒了。这样我就有时间在您着手撰写全文之前，先看一遍并给你一些反馈。 学生：太好了。非常感谢您，教授。这真的帮我理清了思路！

(Shared with Q1.) [Q2] According to the professor, what is one requirement for the term paper assignment?

中文翻译

（与第1题共用音频。）[Q2] 根据教授的说法，期末论文作业的其中一项要求是什么？

(Shared with Q1.) [Q3] Why does the professor suggest writing about the campus wetlands restoration project?

中文翻译

（与第1题共用音频。）[Q3] 教授为什么建议以校园湿地恢复项目为写作主题？

(Shared with Q1.) [Q4] What can be inferred about the student's next step?

中文翻译

（与第1题共享音频。）[Q4] 关于学生接下来的计划，可以推断出什么？

(Shared with Q1.) [Replay: "If you try to cover the entire world's water pollution in five pages, you will only be able to touch the surface."] [Q5] Why does the professor say this: "If you try to cover the entire world's water pollution in five pages, you will only be able to touch the surface."

中文翻译

（与第1题共享。）[重放：“如果你试图用五页纸来阐述全世界的水污染问题，你只能流于表面。”] [第5题] 教授为什么要说这句话：“如果你试图用五页纸来阐述全世界的水污染问题，你只能流于表面。”

NARRATOR: Listen to part of a lecture in a biology class. PROFESSOR: Okay, everyone, let's get started. Up until now, we've focused on how plants are autotrophs—meaning they produce their own food through photosynthesis. But today, we're going to look at some fascinating plants that don't play by the rules. Instead of making food from sunlight, they get it from underground. PROFESSOR: Let's start with a process called mycoheterotrophy. Mycoheterotrophy is a symbiotic relationship where a plant obtains some or—well, in some extreme cases, all of its food from parasitizing fungi, rather than through photosynthesis. PROFESSOR: A classic example of this is the ghost plant, which has the scientific name Monotropa uniflora. If you've ever seen one in a dark forest, you might have mistaken it for a mushroom because it's completely white. It has absolutely no chlorophyll—which, as you know, is the green pigment plants use to absorb light. Since it cannot photosynthesize, it gets one hundred percent of its organic carbon from underground fungi. STUDENT: Um, excuse me, Professor? If the ghost plant gets its food from fungi, where do the fungi get it? Fungi don't photosynthesize either, right? PROFESSOR: Exactly, Diego. Fungi can't photosynthesize. So, how does this work? Well, it happens through what we call Common Mycorrhizal Networks, or CMNs. CMNs are vast underground webs of fungal threads, called hyphae, that physically connect the root systems of different plants. In a typical forest, massive green trees—like oaks or pines—photosynthesize and share their excess carbon with these underground fungi. The ghost plant basically plugs into this network. It tricks the fungi into sharing that tree-derived carbon. So, the ghost plant is actually a parasite on this shared network. PROFESSOR: Now, you might think this is just a rare, all-or-nothing adaptation. But actually, many plants use a hybrid approach called mixotrophy. Mixotrophy is a nutritional strategy where a plant combines normal photosynthesis with mycoheterotrophy. PROFESSOR: Take certain species of green forest orchids, for instance. These orchids are green and can photosynthesize, but they live on the forest floor where it's incredibly shady. During the summer, when the thick tree canopy overhead blocks out almost all sunlight, these orchids can't make enough food. So, they shift their strategy. They start drawing a significant portion of their carbon from the CMN through the fungi. But during the early spring, before the big trees grow their leaves, the orchids photosynthesize much more. PROFESSOR: So, mixotrophy gives these plants incredible ecological flexibility. They aren't helpless parasites like the ghost plant, but they aren't fully independent either. They adjust their food source depending on the light levels available to them. This flexibility is likely why mixotrophy is far more common in the plant kingdom than scientists originally realized. It's a backup plan, a way to survive in highly unpredictable environments. [Q6] What is the lecture mainly about?

中文翻译

旁白：听一段生物课上的讲座片段。 教授：好的，同学们，我们开始上课。到目前为止，我们主要关注的是植物作为自养生物——也就是说，它们通过光合作用自己制造食物。但今天，我们将了解一些不按常理出牌的奇妙植物。它们不利用阳光制造食物，而是从地下获取食物。 教授：我们先来了解一种被称为“菌异养”的过程。菌异养是一种共生关系，植物通过寄生真菌来获取部分——或者在某些极端情况下，全部的食物，而不是通过光合作用。 教授：一个经典的例子是水晶兰，其学名为 Monotropa uniflora。如果你曾在昏暗的森林里见过它，可能会把它误认为是蘑菇，因为它全身通白。它完全不含叶绿素——大家都知道，叶绿素是植物用来吸收光线的绿色色素。由于无法进行光合作用，它百分之百的有机碳都来自于地下真菌。 学生：额，打扰一下，教授？如果水晶兰从真菌那里获取食物，那真菌又是从哪里得到的呢？真菌也不会进行光合作用，对吧？ 教授：完全正确，迭戈。真菌确实无法进行光合作用。那么，这是如何运作的呢？其实，这是通过我们所说的“公共菌根网络”（简称 CMN）实现的。CMN 是由被称为菌丝的真菌丝状体组成的庞大地下网络，它们将不同植物的根系物理连接在一起。在典型的森林中，像橡树或松树这样巨大的绿色乔木进行光合作用，并将多余的碳分享给这些地下真菌。水晶兰基本上就是“接入”了这个网络。它欺骗真菌，让其分享来自乔木的碳。因此，水晶兰实际上是这个共享网络上的寄生虫。 教授：现在，你可能会认为这只是一种罕见的、要么全有要么全无的适应机制。但实际上，许多植物采用的是一种被称为“混合营养”的混合方式。混合营养是一种营养策略，植物将正常的光合作用与菌异养结合起来。 教授：以某些绿色的森林兰花为例。这些兰花是绿色的，可以进行光合作用，但它们生活在光照极差的森林底层。在夏天，当头顶茂密的树冠遮挡了几乎所有的阳光时，这些兰花无法制造足够的食物。于是，它们改变了策略。它们开始通过真菌从公共菌根网络中吸取大量的碳。但在早春，在大树长出叶子之前，兰花会进行更多的光合作用。 教授：因此，混合营养赋予了这些植物难以置信的生态灵活性。它们不像水晶兰那样是毫无自理能力的寄生植物，但也不是完全独立的。它们会根据自己可获得的光照水平来调整食物来源。这种灵活性很可能就是为什么在植物界中，混合营养比科学家最初认识到的要普遍得多。这是一种备用方案，一种在高度不可预测的环境中生存的方式。

(Shared with Q6.) [Q7] According to the professor, how does the ghost plant obtain its organic carbon?

中文翻译

（与第6题共享音频。）[Q7] 根据教授的说法，水晶兰是如何获取其有机碳的？

(Shared with Q6.) [Q8] According to the lecture, what are two characteristics of mixotrophic forest orchids? Choose 2 answers.

中文翻译

（与第6题共享。）[第8题] 根据讲座内容，混合营养型森林兰花具有哪两个特征？请选择2个答案。

(Shared with Q6.) [Q9] Why does the professor mention oak and pine trees?

中文翻译

（与第6题共用。）[Q9] 教授为什么要提到橡树和松树？

(Shared with Q6.) [Q10] According to the professor, what role does the tree canopy play in the survival of mixotrophic orchids?

中文翻译

（与第6题共享。）[第10题] 根据教授的说法，树冠在混合营养型兰花的生存中起到了什么作用？

(Shared with Q6.) [Replay: "Now, you might think this is just a rare, all-or-nothing adaptation."] [Q11] Why does the speaker say this:

中文翻译

（与第6题共享。）[重放：“现在，你可能会觉得这只是一种罕见的、非此即彼的适应特征。”] [第11题] 说话者为什么要说这句话：

NARRATOR: Listen to a conversation between a student and an academic advisor. ADVISOR: Hi, Tomas. Come on in. What can I help you with today? STUDENT: Hi, thanks for seeing me. I'm looking over my graduation audit for this coming spring, and I ran into a bit of a problem. My study-abroad credits from my semester in Spain... they're showing up on my transcript, but they are only listed as general electives. They were supposed to count toward my major in international relations. ADVISOR: Ah, yes, the transfer credit evaluation. Sometimes when credits come from an international institution, the system automatically classifies them as general electives until they're manually reviewed. Did you file a Course Equivalency Form before you left? STUDENT: I thought I did! But, well, actually, I remember filling it out, but I might have forgotten to submit it to the registrar. I had so much to pack, and... you know how it is. Is there any way to fix this now? ADVISOR: Don't panic, it's definitely fixable. But we need to act quickly because graduation clearances are being processed this month. You'll need to fill out a new Course Equivalency Form. You can download it from the department website. You also need to attach the original syllabus from the course you took in Spain—the one on global trade dynamics, right? STUDENT: Yes, that's the one. I still have the syllabus on my laptop. But does it have to be in English? The syllabus is in Spanish. ADVISOR: Fortunately, the international relations department has faculty who can read Spanish, so a translation isn't necessary. However, since the priority deadline for credit adjustments was last Friday, you will have to pay a twenty-five dollar late-processing fee at the bursar's office. Once you pay that, bring the receipt, the form, and the syllabus back to me. STUDENT: Twenty-five dollars? That's a bit annoying, but I guess it's my own fault for not turning in the paperwork last summer. So, once I bring those to you, how long does the approval take? ADVISOR: Usually, the department head reviews these within five business days. Once she signs off on it, I'll update your graduation audit manually. You should see the change online by the end of next week. Oh, and one more thing: make sure the syllabus outlines the grading criteria. If it's too vague, the department head might reject the request, which would delay your graduation. STUDENT: I'm pretty sure it has a detailed grading scale on the last page. I'll double-check before I print it. ADVISOR: Perfect. Just get everything to me by tomorrow, and we will get this sorted out. [Q12] Why does the student go to see the academic advisor?

中文翻译

旁白：听一段学生和学业导师之间的对话。 导师：你好，托马斯。快请进。今天有什么我可以帮你的吗？ 学生：你好，谢谢您抽空见我。我正在查看今年春季学期的毕业学分审核，发现了一个小问题。我在西班牙留学那个学期的学分……它们确实显示在我的成绩单上，但只被列为了公共选修课。它们本来应该算作我国际关系专业的专业课学分的。 导师：啊，是的，转学分评估。有时候，如果学分来自国外的大学，系统会自动把它们归类为公共选修课，直到进行人工审核。你出国前提交过《课程学分认定表》（Course Equivalency Form）吗？ 学生：我以为我交了！不过，额，实际上，我记得我填了表，但可能忘了提交给教务处。我当时有太多行李要收拾了，而且……您懂的。现在还有办法补救吗？ 导师：别慌，这绝对是可以解决的。但我们需要快点行动，因为毕业审核这个月正在进行。你需要重新填写一张《课程学分认定表》。你可以从系网站上下载。你还需要附上你在西班牙修读课程的原始教学大纲——就是关于全球贸易动态的那门课，对吧？ 学生：对，就是那门课。我的电脑里还有教学大纲。不过必须是英文的吗？大纲是西班牙语的。 导师：幸运的是，国际关系学系有能看懂西班牙语的老师，所以不需要翻译。不过，由于学分调整的优先截止日期是上周五，你必须去财务处缴纳25美元的延期处理费。缴费后，把收据、申请表和教学大纲一起交还给我。 学生：25美元？这有点让人郁闷，不过我想这也是我自己去年夏天没交材料的错。那么，等我把这些交给你之后，审批需要多长时间？ 导师：通常，系主任会在五个工作日内进行审核。一旦她签字同意，我会手动更新你的毕业学分审核结果。你应该能在下周末前在网上看到更改。噢，还有一件事：确保教学大纲里列出了评分标准。如果写得太模糊，系主任可能会拒绝申请，这会延迟你的毕业。 学生：我很确定最后一页有详细的评分标准。打印前我会再核对一下。 导师：太好了。明天之前把所有东西交给我，我们就能把这件事解决好。

(Shared with Q12.) [Q13] According to the advisor, why did the student's study-abroad credits appear as general electives?

中文翻译

（与第12题共用音频。）[第13题] 根据学业导师的说法，为什么该学生的留学学分会显示为通用选修课？

(Shared with Q12.) [Q14] What does the student imply about his failure to submit the Course Equivalency Form before leaving?

中文翻译

（与第12题共用音频。）[第14题] 关于在启程前未能提交《课程学分转换表》，该学生暗示了什么？

(Shared with Q12.) [Q15] Why does the advisor mention that faculty members in the international relations department can read Spanish?

中文翻译

（与第12题共用音频。）[第15题] 指导老师为什么要提到国际关系学系的教职工能看懂西班牙语？

(Shared with Q12.) [Replay: "Twenty-five dollars? That's a bit annoying, but I guess it's my own fault for not turning in the paperwork last summer."] [Q16] Why does the student say this:

中文翻译

“二十五美元？虽然有点让人郁闷，但我想这只能怪我自己，去年夏天没能及时提交材料。”

NARRATOR: Listen to part of a lecture in an environmental science class. PROFESSOR: Today, we are moving from marine sediments to terrestrial archives of climate history. Specifically, we'll explore how researchers reconstruct ancient monsoons—those massive, seasonal wind and rain systems—using speleothems. Now, "speleothems" is just a general term for mineral deposits formed in caves, such as stalagmites, which grow upward from cave floors as mineral-laden water drips from the ceiling. PROFESSOR: For decades, geochemists relied almost exclusively on stable oxygen isotopes in these stalagmites to track past rainfall. Actually, let me rephrase that—they didn't just rely on them, they treated them as the absolute gold standard. The logic was simple: during heavy monsoon seasons, the lighter isotope, oxygen-16, is preferentially rained out first, leaving the remaining moisture depleted. Consequently, stalagmite layers formed during wet periods show a lower ratio of oxygen-18 to oxygen-16. PROFESSOR: However, oxygen isotopes can be, well, highly ambiguous. Their ratios are influenced not just by local rainfall amounts, but also by changes in air temperature and even the geographic source of the rain clouds. To resolve this ambiguity, scientists now look at a secondary process called Prior Calcite Precipitation, or PCP. PCP refers to the precipitation of calcium carbonate from drip water before it actually reaches the stalagmite—occurring instead in the cave's overhead rock fractures or on the ceiling. PROFESSOR: Let’s trace the chemistry here. Rainwater absorbs carbon dioxide from the soil, making it slightly acidic. This acidic water dissolves the surrounding limestone rock, which is mostly calcium carbonate, as it travels downward. But when this water enters an air-filled pocket in the cave ceiling, carbon dioxide gas escapes from the water droplets into the cave air. This degassing causes calcite to precipitate early, right there in the cracks. STUDENT: Wait, so if calcite is precipitating early, before it even reaches the floor, does that change the chemical makeup of the water that finally drips down? PROFESSOR: Exactly! That is the key. Calcium is lost during this early precipitation, but other trace elements, specifically magnesium and strontium, tend to remain in the water. They don't fit easily into the crystal structure of the early-forming calcite. Therefore, as PCP progresses, the remaining drip water becomes increasingly enriched in magnesium. By the time it finally falls and forms a new layer on our stalagmite, that layer will have a significantly higher magnesium-to-calcium ratio, or Mg/Ca ratio. PROFESSOR: Now, how does this connect to climate? It all comes down to hydrology and transit time. During dry periods, water percolates very slowly through the ground. This slow movement gives the water plenty of time to degas and deposit calcite in the rock fractures. Thus, dry periods lead to extensive PCP and high Mg/Ca ratios in the stalagmites. During wet monsoon seasons, water rushes through the rock pathways quickly, minimizing the time available for degassing. So, very little PCP occurs, and the stalagmite layers end up with low Mg/Ca ratios. PROFESSOR: To see this in action, let's look at a study from Lianhua Cave in semi-arid northern China. Researchers analyzed a stalagmite spanning the last two millennia. During a known historical warm interval, the oxygen isotope data showed a confusing trend that some scientists initially interpreted as a major regional drought. However, when the researchers measured the Mg/Ca ratios, they found no increase in PCP. The ratios remained low, which indicated that the local environment was actually quite wet. PROFESSOR: It turns out the anomalous oxygen isotope signal wasn't caused by a lack of local rain at all. Instead, it was caused by a shift in the monsoon's moisture source—the rain was originating from a different ocean basin farther away, which altered the isotope signature before the clouds even reached the cave. Without the Mg/Ca proxy to clarify the physical process of PCP, we would have completely mischaracterized the climate of that entire era. [Q17] What is the lecture mainly about?

中文翻译

旁白：听一段环境科学课上的讲座。 教授：今天，我们要从海洋沉积物转向气候历史的陆地档案。具体来说，我们将探讨研究人员如何利用洞穴沉积物（也就是次生化学沉积物）来重建古代季风——即那些大规模的季节性风雨系统。现在，“洞穴沉积物”只是对洞穴中形成的矿物沉积物的统称，比如石笋，它们是由富含矿物质的水从洞顶滴落，在洞穴地面上向上生长而成的。 教授：几十年来，地球化学家几乎完全依赖这些石笋中的稳定氧同位素来追踪过去的降雨量。事实上，让我换个说法——他们不仅仅是依赖它们，而是将其奉为绝对的金科玉律。其逻辑很简单：在强烈的季风季节，较轻的同位素氧-16会优先以降雨形式排出，导致剩余的水汽中该同位素减少。因此，在湿润时期形成的石笋层中，氧-18与氧-16的比值较低。 教授：然而，氧同位素可能，怎么说呢，非常具有多义性。它们的比值不仅受到当地降雨量的影响，还受到气温变化甚至雨云地理来源的影响。为了解决这种不确定性，科学家们现在开始关注一个次生过程，称为“前期方解石沉淀”（Prior Calcite Precipitation，简称 PCP）。PCP是指滴水在实际到达石笋之前，其中的碳酸钙就提前发生沉淀的过程——这通常发生在洞穴顶部的岩石裂隙或洞顶。 教授：让我们来分析一下这里的化学过程。雨水吸收土壤中的二氧化碳，使其呈微酸性。这种酸性水在向下渗透时会溶解周围的石灰岩（主要成分是碳酸钙）。但是，当这些水进入洞顶充满空气的空腔时，二氧化碳气体就会从水滴中逸出到洞穴空气中。这种脱气作用导致方解石提前沉淀，就发生在外面的岩石裂缝中。 学生：等等，所以如果方解石在到达洞底之前就提前沉淀了，这会改变最后滴落下来的水的化学组成吗？ 教授：没错！这正是关键所在。在这种早期沉淀过程中，钙流失了，但其他微量元素，特别是镁和锶，往往会留在水中。它们不易融入早期形成的方解石晶体结构中。因此，随着PCP过程的进行，剩余的滴水中镁的含量会越来越高。当它最终滴落并在我们的石笋上形成新的一层时，这一层的镁钙比（即 Mg/Ca 比值）就会显著升高。 教授：那么，这与气候有什么关系呢？这完全取决于水文学和运移时间。在干旱时期，水在地下渗透得非常缓慢。这种缓慢的移动使水有充足的时间在岩石裂隙中脱气并沉积方解石。因此，干旱期会导致大面积的PCP，从而在石笋中产生高 Mg/Ca 比值。而在湿润的季风季节，水迅速流过岩石通道，减少了脱气所需的时间。因此，极少发生PCP，石笋层最终的 Mg/Ca 比值也较低。 教授：为了看看实际效果，让我们来看看对中国北方半干旱地区莲花洞的一项研究。研究人员分析了一根跨越过去两千年的石笋。在一个已知历史温暖期内，氧同位素数据显示出一种令人困惑的趋势，一些科学家最初将其解释为该地区发生了一次大范围的干旱。然而，当研究人员测量 Mg/Ca 比值时，他们发现PCP并没有增加。该比值保持在较低水平，这表明当地环境实际上非常湿润。 教授：事实证明，异常的氧同位素信号根本不是因为当地缺雨造成的。相反，它是由于季风水汽来源的改变——降雨源自更远的其他大洋盆地，这在雨云到达洞穴之前就改变了其同位素特征。如果没有利用 Mg/Ca 这一指标来澄清PCP的物理过程，我们就会完全误判整个时期的气候特征。

(Shared with Q17.) [Q18] According to the professor, what happens to drip water during Prior Calcite Precipitation (PCP)?

中文翻译

（与第17题共享音频。）[第18题] 根据教授的说法，在前期方解石沉淀（PCP）过程中，滴水会发生什么变化？

(Shared with Q17.) [Q19] Why does the professor discuss the chemical process of carbon dioxide degassing?

中文翻译

（与第17题共用音频。）[Q19] 教授为什么要讨论二氧化碳脱气的化学过程？

(Shared with Q17.) [Q20] Based on the lecture, how did the researchers at Lianhua Cave determine that the historical warm interval was actually wet rather than dry?

中文翻译

（与第17题共享。）[第20题] 根据讲座内容，莲花洞的研究人员是如何确定历史上的温暖期实际上是湿润而非干燥的？

(Shared with Q17.) [Q21] What can be inferred about the use of oxygen isotopes alone in paleoclimate reconstruction?

中文翻译

（与第17题共享音频。）[第21题] 关于在古气候重建中仅使用氧同位素，可以推断出什么？

(Shared with Q17.) [Replay: "Actually, let me rephrase that—they didn't just rely on them, they treated them as the absolute gold standard."] [Q22] Why does the professor say this:

中文翻译

（与第17题共用。）[重放：“事实上，让我换个说法——他们不仅仅是依赖这些数据，而是将它们奉为绝对的黄金标准。”]

NARRATOR: Listen to part of a lecture in a psychology class. PROFESSOR: Good morning, everyone. Today we are continuing our exploration of visual memory. Now, when we recall a scene we've looked at, we tend to think of... uh, our memory as acting like a camera, capturing a precise, framed snapshot of the world. But cognitive psychology tells us a very different story. One of the most fascinating phenomena in this area is what we call boundary extension. This is a robust cognitive distortion—or rather, a cognitive illusion—where people remember seeing more of a scene than was actually present in the original visual input. In other words, our brains automatically fill in what we assume must lie just beyond the edges of the picture. STUDENT: So, wait, Professor... if I look at a picture of a dog in a park, and the picture cuts off at the dog's tail, my memory will actually construct the rest of the grass and trees? PROFESSOR: Exactly, Nikolai. You would likely recall a wider-angle view than you actually saw. And this isn't just a random guess; it is driven by what psychologists call a perceptual schema. A schema is an organized mental framework of knowledge and expectations about the world. When we see a cropped image, our schema for a park or a kitchen instantly tells us how that environment should logically continue. We then project this expected information onto our memory. Now, why does this happen? Well, it involves a cognitive process known as a source-monitoring error. This is a specific memory confusion where we fail to distinguish between the actual external visual stimulus we perceived and our own internal, schema-based mental extrapolations. The brain blends these two sources together, and we genuinely believe we saw the extended background with our own eyes. Let's look at how researchers demonstrated this. In a classic study, participants were shown close-up photographs—say, a single trash can on a street corner—for only a few seconds. Later, they were asked to reconstruct the scene, either by drawing it or by adjusting a zoom lens on a camera to recreate the original framing. Interestingly, participants consistently drew the trash can smaller than it actually was, and filled in more of the surrounding sidewalk and background. They had extended the boundaries. But here is the twist: this effect is highly asymmetrical. If researchers show participants a very wide-angle photograph of the same scene, the boundary extension effect is dramatically reduced, and sometimes we even see the opposite—boundary restriction, where people remember the scene as more cropped than it was. This suggests that our brain's boundary-filling mechanism is specifically tuned to 'complete' close-up views because close-ups feel incomplete to our spatial expectation. Now, you might think, 'Well, this means our memory is deeply flawed.' But from an evolutionary perspective, boundary extension is actually highly adaptive. In real life, our eyes are constantly moving in rapid jumps called saccades, and we blink thousands of times a day. If our brain didn't seamlessly integrate these fragmented visual inputs by predicting what lies just beyond our current focus, the world would look like a jarring, disjointed slideshow. Boundary extension helps create the illusion of a continuous, stable three-dimensional environment. So, what appears to be a memory error is actually a sign of a highly efficient, predictive visual system. [Q23] What is the lecture mainly about?

中文翻译

旁白：听一段心理学课上的讲座片段。 教授：大家早上好。今天我们继续探讨视觉记忆。当我们回忆看过的场景时，往往会觉得……呃，我们的记忆就像一台相机，精准地拍下了世界的一个有边界的快照。但认知心理学告诉我们一个截然不同的故事。这一领域最引人入胜的现象之一就是我们所说的“边界扩展”（boundary extension）。这是一种普遍存在的认知偏差——或者更准确地说，是一种认知错觉——即人们在记忆中看到的场景比原始视觉输入中实际呈现的要多。换句话说，我们的大脑会自动填充我们认为必定存在于画面边缘之外的内容。 学生：等等，教授……如果我看到一张公园里狗的照片，而照片在狗尾巴那里截断了，我的记忆实际上会自行构建出其余的草地和树木吗？ 教授：完全正确，尼古拉（Nikolai）。你记忆中的画面可能会比你实际看到的视野更宽。这不仅仅是随机的猜测，而是由心理学家所说的“知觉图式”（perceptual schema）所驱动的。图式是一种关于世界的知识和预期的有条理的心理框架。当我们看到一张被裁剪过的图片时，我们对于公园或厨房的图式会立刻告诉我们，那个环境在逻辑上应该如何延伸。然后，我们会把这种预期的信息投影到记忆中。 那么，为什么会这样呢？实际上，这涉及一个被称为“来源监控错误”（source-monitoring error）的认知过程。这是一种特定的记忆混淆，我们无法区分实际感知到的外部视觉刺激与我们自身内部基于图式的心理外推。大脑将这两个来源融合在一起，让我们深信自己亲眼看到了扩展后的背景。 让我们来看看研究人员是如何证实这一点的。在一项经典研究中，研究人员向受试者展示了仅持续几秒钟的特写照片，比如街角的一个垃圾桶。随后，受试者被要求重建该场景，方式要么是画出来，要么是通过调节相机变焦镜头来重现原始构图。有趣的是，受试者画出来的垃圾桶无一例外都比实际的要小，并且填充了更多周围的步行道和背景。他们扩展了边界。 但关键的转折在这里：这种效应是高度不对称的。如果研究人员向受试者展示同一场景的超广角照片，边界扩展效应就会显著减弱，有时我们甚至会看到相反的情况——“边界收缩”（boundary restriction），即人们记忆中的场景比实际被裁剪得更厉害。这表明，我们大脑的边界填充机制是专门为了“完善”特写镜头而调整的，因为特写镜头在我们的空间预期中会显得不完整。 此时，你可能会想：“好吧，这意味着我们的记忆有很大的缺陷。”但从进化角度来看，边界扩展实际上具有高度的适应性。在现实生活中，我们的眼睛不断进行快速跳动（称为“眼跳”），而且我们一天要眨眼数千次。如果我们的大脑不能通过预测当前焦点之外的事物来无缝整合这些零碎的视觉输入，那么世界看起来就会像是一个刺眼、脱节的幻灯片。边界扩展有助于创造一个连续、稳定的三维环境错觉。因此，看似是记忆错误，实则是一个高效且具有预测功能的视觉系统的体现。

(Shared with Q23.) [Q24] According to the professor, what role do perceptual schemas play in boundary extension?

中文翻译

（与第23题共用。）[第24题] 根据教授的说法，知觉图式在边界扩展中起到了什么作用？

(Shared with Q23.) [Q25] In the experiment described by the professor, what did participants do that demonstrated boundary extension? Choose 2 answers.

中文翻译

（与第23题共享音频。）[第25题] 在教授所描述的实验中，被试的哪些行为展现了边界扩展（boundary extension）？请选择2个答案。

(Shared with Q23.) [Q26] Why does the professor discuss the difference between close-up and wide-angle photographs?

中文翻译

（与第23题共用音频。）[第26题] 教授为什么要讨论特写照片和广角照片之间的区别？

(Shared with Q23.) [Q27] What does the professor imply about the "flawed" nature of human visual memory?

中文翻译

（与第23题共享音频。）[第27题] 关于人类视觉记忆的“缺陷”特征，教授暗示了什么？

(Shared with Q23.) [Replay: "Now, when we recall a scene we've looked at, we tend to think of... uh, our memory as acting like a camera, capturing a precise, framed snapshot of the world. But cognitive psychology tells us a very different story."] [Q28] Why does the speaker say this:

中文翻译

（与第23题共用。）[重放：“现在，当我们回想起看过的某个场景时，我们往往会认为……呃，我们的记忆就像相机一样，捕捉到了关于这个世界的一张精确、有边界的快照。但认知心理学告诉我们的却是一个完全不同的故事。”][第28题]