TOEFL 托福 听力原创模拟题 1

NARRATOR: Listen to a conversation between a student and a professor. STUDENT: Hi, Professor. Um, do you have a few minutes to talk? I wanted to get some quick feedback on my draft for the biology paper. PROFESSOR: Of course, Diego. Come on in. You are writing about ecosystems, right? STUDENT: Yes. But I am having a big problem with the introduction. I already wrote three pages, but I feel like my main topic is just too broad. PROFESSOR: Let me see... Ah, yes. You are trying to cover the entire Amazon rainforest ecosystem. That is definitely too big for a five-page paper. You will run out of space very quickly. STUDENT: That is what I was worried about. So, should I, you know, focus on just one specific organism instead? PROFESSOR: Exactly. For example, you could write about how orchids survive on high tree branches. That will keep your paper focused and well under the five-page limit. STUDENT: That is a great idea. I will change my focus to orchids. Also, I wanted to double-check the deadline for submitting this draft to you. PROFESSOR: The final deadline for submitting drafts for my review is this Wednesday at 4:00 PM. Oh, wait, my mistake, it is actually Thursday at 4:00 PM. That gives me enough time to read them before our Friday lecture. STUDENT: Okay, perfect. I will work on the orchid topic tonight and email you the draft by Thursday afternoon. PROFESSOR: Sounds like a plan, Diego. Remember, when you write about the orchids, make sure to explain their symbiotic relationship with the trees. That is a key concept we discussed last week. STUDENT: Right, the relationship where one organism benefits and the other is not harmed. Commensalism, correct? PROFESSOR: Yes, exactly! If you include that term and define it, your paper will be in excellent shape. STUDENT: Thank you, Professor. I really appreciate your help. See you in class on Friday. PROFESSOR: You are welcome, Diego. Have a good afternoon. [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。额，您有几分钟时间聊聊吗？我想请您对我的生物学论文草稿提一些简要的反馈意见。 教授：当然可以，迭戈。快进来。你是写关于生态系统的，对吧？ 学生：是的。但我在引言部分遇到了很大的问题。我已经写了三页，但我觉得我的主旨话题实在太宽泛了。 教授：让我看看……啊，是的。你试图涵盖整个亚马逊雨林生态系统。对于一篇五页纸的论文来说，这确实太宏大了。你很快就会没有空间写了。 学生：这正是我的担心所在。所以，我是不是应该，您知道，改为只关注一种特定的生物？ 教授：没错。比如，你可以写兰花是如何在高树枝上生存的。这能让你的论文保持专注，且完全控制在五页的字数限制内。 学生：这是个好主意。我把关注点改成兰花。另外，我想再次确认一下向您提交草稿的截止日期。 教授：我评阅草稿的最终截止时间是这周三下午4点。哦，等等，我记错了，实际上是周四下午4点。这样在周五上课前，我有足够的时间来阅读它们。 学生：好的，太棒了。我今晚就写兰花这个话题，并在周四下午前把草稿发邮件给您。 教授：听起来是个不错的计划，迭戈。记住，在写兰花时，一定要解释它们与树木的共生关系。那是我们上周讨论的一个核心概念。 学生：对，就是一种生物获益而另一种生物不受伤害的关系。片利共生，对吗？ 教授：是的，完全正确！如果你把这个术语写进去并给出定义，你的论文就会非常出色。 学生：谢谢您，教授。非常感谢您的帮助。周五课堂上见。 教授：不客气，迭戈。下午愉快。

(Shared with Q1.) [Q2] According to the professor, what is the main problem with the student's current draft?

中文翻译

（与第1题共用音频。）[第2题] 根据教授的说法，学生目前的草稿存在的主要问题是什么？

(Shared with Q1.) [Q3] What is the deadline for the student to email his draft to the professor?

中文翻译

（与第1题共用）[第3题] 学生最迟要在什么时候给教授发送草稿邮件？

(Shared with Q1.) [Q4] What can be inferred about the concept of commensalism?

中文翻译

（与第1题共用音频。）[Q4] 关于“片利共生”（commensalism）这一概念，可以推断出什么？

(Shared with Q1.) [Replay: "Oh, wait, my mistake, it is actually Thursday at 4:00 PM."] [Q5] Why does the professor say this:

中文翻译

（与第1题共用。）[重放：“哦，等等，我弄错了，实际上是周四下午4点。”]

NARRATOR: Listen to part of a lecture in a biology class. PROFESSOR: Okay, today we are going to look at an incredible ecological partnership in the plant world. Specifically, how some flowering plants depend on insects—not for pollination, which we have already covered, but for dispersing their seeds. This process is called myrmecochory. Simply put, myrmecochory is the dispersal of seeds by ants. It is a mutually beneficial relationship, or a mutualism, found in thousands of plant species worldwide, especially in temperate forest floors. PROFESSOR: Now, how does a plant convince an ant to do the heavy lifting of carrying its seeds all the way back to the nest? Well, these plants produce seeds with a special external structure called an elaiosome. An elaiosome is a fleshy, lipid-rich appendage attached directly to the seed coat. It is packed with lipids, proteins, and essential vitamins that are highly nutritious and attractive to ants. STUDENT: Um, excuse me, Professor. Do the ants end up eating the seed itself? Because, you know, if they eat the seed, it can't grow into a new plant, right? PROFESSOR: Excellent question, Tomas. No, they don't. You see, the ant picks up the seed by the elaiosome, carries it back to its underground nest, and feeds the nutritious appendage to its larvae. The actual seed—which has a tough outer coat and is completely inedible to the ants—remains entirely undamaged. Once the elaiosome is consumed, the ants carry the bare seed out of their main living quarters and discard it in their underground waste dump, or refuse chamber. PROFESSOR: And this is where the magic happens. The nest's waste chamber is essentially a protected, nutrient-rich compost pile. It is rich in organic matter, which shelters the seed from predators like birds or rodents, and protects it from forest fires. So, the seed is deposited in the perfect environment to germinate. PROFESSOR: But here is where it gets even more fascinating. Recent research shows that plants don't just rely on nutritional rewards. They also use chemical mimicry. This refers to the plant producing chemical compounds on the elaiosome that chemically mimic, or imitate, the odor of insects. Specifically, some plants release certain fatty acids that smell exactly like dead insects or ant prey. To an ant, this olfactory signal says, 'Hey, this is valuable food, pick me up immediately!' The ant is essentially tricked by its own chemical communication system into transport—uh, transporting the seed. It's a highly elegant evolutionary strategy. By manipulating the ants' hardwired sensory systems, these plants guarantee their offspring are safely tucked away underground. [Q6] What is the lecture mainly about?

中文翻译

旁白：请听生物课上的一部分讲座。 教授：好的，今天我们要探讨植物界中一种令人惊叹的生态合作关系。具体来说，就是一些有花植物是如何依赖昆虫的——不是为了我们已经讲过的传粉，而是为了传播它们的种子。这个过程被称为“蚂蚁播种”（myrmecochory）。简单来说，蚂蚁播种就是蚂蚁帮植物传播种子。这是一种互利共生关系（mutualism），存在于全球成千上万种植物中，尤其是在温带森林的地表。 教授：那么，植物是如何说服蚂蚁承担重任，一路把种子搬回蚁巢的呢？其实，这些植物产生的种子具有一种特殊的外部结构，叫做“油质体”（elaiosome）。油质体是直接附着在种皮上的肉质且富含脂质的附属物。它充满了脂质、蛋白质和必需维生素，营养丰富，对蚂蚁极具吸引力。 学生：呃，打扰一下，教授。蚂蚁最后会把种子本身吃掉吗？因为，您知道，如果它们把种子吃了，种子就不能长成新植物了，对吧？ 教授：问得好，托马斯。不，它们不会吃。你看，蚂蚁会咬住油质体把种子衔起来，带回它们的地下巢穴，然后把这个营养丰富的附属物喂给幼虫。而真正的种子——外壳坚硬，蚂蚁完全无法食用——则完好无损。一旦油质体被吃完，蚂蚁就会把光秃秃的种子从它们的主要生活区运走，丢弃在地下垃圾堆（即废弃室）里。 教授：奇迹就在这里发生了。蚁巢的废弃室本质上是一个受到保护、营养丰富的堆肥堆。它富含有机质，不仅能保护种子免受鸟类或鸟类等捕食者的侵害，还能防止森林火灾。因此，种子被放置在了最适合发芽的完美环境中。 教授：但更令人着迷的地方还在后面。最近的研究表明，植物不仅仅依赖营养奖励。它们还利用化学拟态。这是指植物在油质体上产生化学化合物，从而在化学层面上模拟或模仿昆虫的气味。具体来说，一些植物会释放出特定的脂肪酸，闻起来和死昆虫或蚂蚁的猎物一模一样。对蚂蚁来说，这种嗅觉信号在说：“嘿，这是珍贵的食物，快把我搬走！”蚂蚁实际上被它们自己的化学通讯系统给欺骗了，从而搬运——呃，搬运了种子。这是一种极其精妙的进化策略。通过操控蚂蚁固有的感官系统，这些植物确保了它们的后代能安全地藏在地下。

(Shared with Q6.) [Q7] According to the professor, what is an elaiosome?

中文翻译

（与第6题共用。）[第7题] 根据教授的说法，什么是油质体？

(Shared with Q6.) [Q8] According to the professor, what are two benefits that a plant seed receives from being discarded in an ant nest's waste chamber? Choose 2 answers.

中文翻译

根据教授的说法，植物种子被丢弃在蚁巢的垃圾室中可以获得哪两个好处？请选择2个答案。

(Shared with Q6.) [Q9] Why does the professor mention that the outer coat of the seed is tough and inedible?

中文翻译

（与第6题共用）[第9题] 教授为什么要提到种子的外壳坚硬且不可食用？

(Shared with Q6.) [Q10] According to the professor, how do some plants use chemical mimicry to influence ants?

中文翻译

（与第6题共享音频。）[第10题] 根据教授的说法，某些植物是如何利用化学拟态来影响蚂蚁的？

(Shared with Q6.) [Replay: "The ant is essentially tricked by its own chemical communication system into transport—uh, transporting the seed."] [Q11] Why does the speaker say this:

中文翻译

（与第6题共享。）[重放：“蚂蚁基本上是被它们自身的化学通讯系统所欺骗，从而去运——呃，去运送种子的。”] [第11题] 说话者为什么要说这句话：

NARRATOR: Listen to a conversation between a student and a registrar office administrator. STUDENT: Hi there. Um, my name is Tomas. I'm a senior, and I'm planning to graduate this coming spring. I'm here because I was checking my online degree audit, and, well, it says I'm three credits short of the general education requirement for social sciences. But I was sure I'd completed that. STAFF: Hello, Tomas. Let me pull up your file... Okay, I see your record here. Yes, the system shows you have 117 credits, but you need 120 to graduate, with those three missing from social sciences. Did you take a course that maybe didn't get counted? STUDENT: Right, that's what I think happened. Last summer, I took an introductory sociology course at Westmore Community College. I had the official transcript sent here directly from their registrar back in August, but it's not showing up on my portal. STAFF: Ah, I see. Let me check our pending transfer credit database... Ah, yes, here it is. The transcript from Westmore did arrive, but it looks like there's a hold on it because of a missing Transfer Course Equivalency Form. Did you submit one of those before you took the class? STUDENT: A course equivalency form? I don't think I did. I thought as long as it was an accredited college, the credits would just transfer over automatically. STAFF: Unfortunately, no. To make sure a course at another institution matches our curriculum, our department heads have to review the syllabus and sign off on it. Without that signed form, the credits just sit in our queue. But don't worry, we can get this sorted out. STUDENT: Oh, good. Because the deadline to submit the final Graduation Audit Petition is... well, it's this coming Friday at five, right? I'm a bit stressed about missing it. STAFF: Yes, Friday at five is correct. Here's what you need to do. First, download the Transfer Course Equivalency Form from our website. You'll need to email it to the head of the Sociology department, along with the syllabus of the course you took at Westmore. Once they sign it to confirm it's equivalent to our Intro to Sociology, they'll email it back to you, and you can forward it to us. STUDENT: Okay, that sounds manageable. But what if the department chair doesn't get back to me by Friday? Professors are usually pretty busy. STAFF: Tell you what. Go ahead and submit your Graduation Audit Petition today online. There's a checkbox on the form that says "Pending Transfer Credit." If you check that, it alerts our office that an external transcript is being processed. That way, you won't miss the Friday deadline, even if the department chair takes a few extra days to sign off on the equivalency. STUDENT: Oh, that is such a relief! I'll fill out the petition right now. Thank you so much for your help. STAFF: You're very welcome, Tomas. Just make sure to get that equivalency form to the sociology department as soon as possible so we can finalize everything. [Q12] Why does the student go to see the registrar office administrator?

中文翻译

旁白：听一段学生和教务处管理员之间的对话。 学生：您好。呃，我叫托马斯。我是大四学生，计划今年春季毕业。我来这里是因为我刚才在网上查看了我的学位审核进度，上面显示我还差三个社会科学类的通识教育学分。但我确定我已经修完这部分学分了。 管理员：你好，托马斯。我来调出你的档案看一下……好的，我看到你的记录了。是的，系统显示你目前有117个学分，但你需要120个学分才能毕业，缺的这3个学分正是社会科学类的。你是不是修了某门课，但可能没有计入系统？ 学生：对，我觉得就是这么回事。去年夏天，我在威斯特摩社区学院修了一门社会学导论。我早在八月份就让他们学校的教务处把官方成绩单直接寄到这里了，但我的个人门户网站上没有显示。 管理员：啊，我明白了。让我查一下我们的待处理转学分数据库……啊，是的，在这里。威斯特摩寄来的成绩单确实到了，但由于缺少《转学分课程等值申请表》，该成绩单目前处于暂挂状态。你在上这门课之前提交过这张表吗？ 学生：课程等值申请表？我想我没交过。我以为只要是认证过的大学，学分就会自动转过来。 管理员：不幸的是，并不会。为了确保其他学校的课程符合我们的课程体系，我们的系主任必须审核课程大纲并签字批准。没有那张签字的表格，学分就只能在我们的处理队列里搁置。不过别担心，我们可以解决这个问题。 学生：噢，那就好。因为提交最终毕业审核申请的截止日期是……嗯，是本周五下午五点，对吧？我很担心会错过截止时间。 管理员：是的，周五五点没错。你需要做的是：首先，从我们的网站上下载《转学分课程等值申请表》。你需要把这张表连同你在威斯特摩修的那门课的课程大纲一起发邮件给社会学系主任。一旦他们签字确认这门课等同于我们的“社会学导论”，他们会把表发回给你，然后你再转发给我们。 学生：好的，听起来还可以搞定。但如果系主任周五之前没回复我怎么办？教授们通常都很忙。 管理员：我给你支个招。你今天就在网上提交你的毕业审核申请。表上有一个勾选项，写着“待处理转学分”。如果你勾选了那个，就会提醒我们办公室有外部成绩单正在处理中。这样一来，即使系主任需要多花几天时间来签署等值确认，你也不会错过周五的截止日期。 学生：噢，这下我就放心了！我马上就去填申请。太感谢您的帮助了。 管理员：不客气，托马斯。一定要尽快把那份等值申请表发给社会学系，这样我们才能最终敲定一切。

(Shared with Q12.) [Q13] According to the administrator, why were the student's transfer credits not added to his record?

中文翻译

（与第12题共用音频。）[Q13] 根据教务老师的说法，为什么该学生的转学分没有录入到他的成绩记录中？

(Shared with Q12.) [Q14] What can be inferred about the student's attitude regarding contacting the sociology department head?

中文翻译

（与第12题共用音频。）[第14题] 关于联系社会学系主任，可以推断出该学生持有什么态度？

(Shared with Q12.) [Q15] Why does the administrator mention the "Pending Transfer Credit" checkbox?

中文翻译

（与第12题共享。）[第15题] 管理人员为什么要提到“Pending Transfer Credit”复选框？

(Shared with Q12.) [Replay: "Tell you what."] [Q16] Why does the administrator say this: "Tell you what."

中文翻译

（与第12题共用。）[重放：“Tell you what。”] [第16题] 管理员为什么要这样说：“Tell you what”？

NARRATOR: Listen to part of a lecture in an environmental science class. PROFESSOR: When we picture glaciers, we typically imagine pristine, white expanses of ice. But if you actually walk onto a glacier, especially during the summer, you'll find it's often peppered with tiny, water-filled pits. These are called cryoconite holes. And today, we're going to explore how these miniature features play a massive role in both glacial melt rates and global carbon cycles. Let’s start with what creates them. The process begins with 'cryoconite'—a term for the dark, powdery dust that settles on ice surfaces. This dust is a complex mixture of fine mineral soil, industrial soot carried by winds from hundreds of miles away, and organic matter, including microbes. Now, because this dust is dark, it has a very low albedo. Albedo, as you may recall, is the measure of how much solar radiation a surface reflects. While clean ice reflects up to eighty percent of sunlight, cryoconite reflects very little. Consequently, the dust absorbs solar heat, melts the underlying ice, and sinks vertically, forming a cylindrical pocket of water with a layer of dark sediment at the bottom. Now, you might think these holes are scattered uniformly, but they are concentrated in specific regions. They primarily form in the accumulation zone—uh, correction, the ablation zone. That’s the lower portion of the glacier where annual ice loss from melting exceeds the accumulation of new winter snow. In the ablation zone, the winter snow melts away, exposing the older glacier ice beneath and allowing the cryoconite to gather and melt inward. STUDENT: Professor, if the dark dust keeps absorbing heat, what stops it? I mean, why don't these cryoconite holes just melt all the way through the glacier to the bedrock? PROFESSOR: That seems logical, doesn't it? If it's dark, it absorbs heat, so it should just keep boring downward. But actually, a physical constraint prevents this. As a cryoconite hole deepens, the surrounding ice walls begin to shade the sediment at the bottom. At a certain depth, the angle of the sun is such that the bottom of the hole receives very little direct solar radiation. The system reaches what’s known as a thermal equilibrium depth—typically between twenty and fifty centimeters deep—where the heat absorbed by the sediment matches the heat lost to the surrounding cold ice. So, the hole stops deepening. But here’s where it gets truly fascinating. These holes are not just physical features; they are highly active 'biophotoreactors'—a term scientists use to describe self-sustaining, biological systems powered by light. The cyanobacteria in the cryoconite sediment perform photosynthesis, capturing carbon dioxide dissolved in the water and turning it into organic matter. The cyanobacteria actually secrete a sticky substance—extracellular polymeric substances, or EPS—which binds the loose mineral dust and soot together into stable granules. This biological binding prevents the wind from easily blowing the dark material away, keeping it anchored to the ice and driving the melting process over successive years. This organic matter then feeds other microscopic life-forms, like tardigrades and rotifers, which live inside these tiny wells. In fact, researchers have found that these holes can accumulate significant amounts of organic carbon. During the late summer melt-out, when the glacier surface degrades, the water and organic material stored in these holes are released. This nutrient-rich runoff is swept downslope, where it fuels downstream ecosystems, like glacial rivers and coastal fjords. But this also has a feedback effect. As the ice melts, the dark sediment is redistributed across the glacier’s surface, further lowering the overall albedo of the ablation zone, which, in turn, accelerates the melting of the entire glacier. So, these tiny, microscopic habitats actually dictate large-scale physical changes on a regional level. [Q17] What is the lecture mainly about?

中文翻译

旁白：请听一段环境科学课上的讲座。 教授：当我们脑海中浮现出冰川时，通常会想到一片洁白无瑕的冰原。但如果你真的走上冰川，尤其是在夏天，你会发现冰川表面往往点缀着一个个装满水的小坑。这些被称为“冰尘孔”（cryoconite holes）。今天，我们将探讨这些微小的特征如何在冰川消融率和全球碳循环中发挥巨大作用。我们先从它们的形成原因说起。这一过程始于“冰尘”（cryoconite）——这是指积在冰面上的暗色粉末状尘埃。这种尘埃是一种复杂的混合物，由细微的矿物土壤、从数百英里外被风吹来的工业烟尘以及包括微生物在内的有机物组成。既然这种尘埃呈暗色，其反照率（albedo）就会非常低。大家可能还记得，反照率是衡量表面反射多少太阳辐射的指标。干净的冰可以反射高达80%的阳光，而冰尘反射的阳光却极少。因此，尘埃会吸收太阳热量，融化下方的冰，并垂直向下沉降，从而形成一个圆柱形的水坑，底部有一层暗色的沉积物。此时你可能会认为这些冰尘孔是均匀分布的，但其实它们集中在特定的区域。它们主要形成于积累区——额，更正一下，是消融区（ablation zone）。那是冰川的下部，在那里，每年因融化而减少的冰量超过了冬季新积雪的量。在消融区，冬季的积雪融化，露出了下方更古老的冰川冰，这使得冰尘得以聚集并向内融化。 学生：教授，如果暗色尘埃不断吸收热量，那是什么阻止了它继续融化呢？我的意思是，为什么这些冰尘孔没有直接融穿整个冰川，一直融到基岩呢？ 教授：这听起来很有道理，不是吗？如果它是暗色的，它就会吸收热量，所以它应该一直向下钻。但实际上，一种物理限制阻止了这种情况的发生。随着冰尘孔加深，周围的冰墙开始遮挡底部的沉积物。在达到一定深度后，太阳的角度使得孔底接收到的直接太阳辐射变得微乎其微。系统达到了所谓的“热平衡深度”（thermal equilibrium depth）——通常在20到50厘米深之间——在这个深度，沉积物吸收的热量与流失到周围冷冰中的热量相平衡。因此，冰尘孔就不会再加深了。但真正奇妙的地方在于，这些冰尘孔不仅仅是物理特征，它们还是高度活跃的“生物光反应器”（biophotoreactors）——科学家用这个词来描述由光驱动的自给自足的生物系统。冰尘沉积物中的蓝细菌进行光合作用，捕捉溶解在水中的二氧化碳并将其转化为有机物。蓝细菌实际上会分泌一种粘性物质——即胞外聚合物（EPS）——它将松散的矿物尘埃和烟尘粘合在一起，形成稳定的颗粒。这种生物粘合作用防止了风轻易吹走这些暗色物质，使其固定在冰面上，并在接下来的几年里持续推动融化过程。接着，这些有机物会抚育生活在这些微型水坑中的其他微观生命形式，比如缓步动物和轮虫。事实上，研究人员发现这些冰尘孔可以积累大量的有机碳。在夏末消融期间，当冰川表面退化时，这些冰尘孔中储存的水和有机物就会被释放出来。这种富含营养物的径流顺流而下，滋养着下游的生态系统，如冰川河流和沿海峡湾。但这也会产生反馈效应。随着冰的融化，暗色沉积物重新分布在冰川表面，进一步降低了消融区的整体反照率，从而反过来加速了整个冰川的融化。因此，这些微小的微生物栖息地实际上决定了区域尺度上的大规模物理变化。

(Shared with Q17.) [Q18] According to the professor, what is the role of the sticky substance secreted by cyanobacteria?

中文翻译

（与第17题共享。）[第18题] 根据教授的说法，蓝细菌分泌的黏性物质有什么作用？

(Shared with Q17.) [Q19] Why does the professor mention the "ablation zone" of a glacier?

中文翻译

（与第17题共享听力文本。）[Q19] 教授为什么要提到冰川的“消融区”？

(Shared with Q17.) [Q20] Based on the lecture, how does the depth of a cryoconite hole regulate its own growth?

中文翻译

（与第17题共用材料。）[第20题] 根据讲座内容，冰尘孔的深度是如何调节其自身生长的？

(Shared with Q17.) [Q21] What can be inferred about the downstream ecosystems that receive runoff from glaciers in late summer?

中文翻译

（与第17题共用音频。）[第21题] 关于在夏末接收冰川径流的下游生态系统，可以推断出什么？

(Shared with Q17.) [Replay: "That seems logical, doesn't it? If it's dark, it absorbs heat, so it should just keep boring downward."] [Q22] Why does the speaker say this:

中文翻译

“这听起来挺合乎逻辑的，不是吗？如果是深色的，它就会吸收热量，所以它应该会一直向下钻。”

NARRATOR: Listen to part of a lecture in a linguistics class. PROFESSOR: Good morning, everyone. Today, we're diving into developmental psycholinguistics, specifically how infants acquire the meanings of verbs. Now, nouns are relatively straightforward. A parent points to a cup and says, 'cup.' The child associates the sound with the physical object. But verbs—verbs are trickier. How does a toddler figure out what words like 'think,' 'give,' or 'push' actually mean when the physical world is full of simultaneous, confusing actions? For decades, the dominant view was what we call semantic bootstrapping. Semantic bootstrapping is the theory that children use their innate knowledge of semantic categories—like identifying who is performing an action, the 'agent,' and who is receiving it, the 'patient'—to map out the basic grammatical structure of their native language. So, they see a dog chasing a cat, recognize the dog as the cause or agent, and assume that 'dog' must be the subject of the sentence. But this theory has a, uh, a major blind spot. It doesn't fully explain how children learn verbs that aren't easily paired with obvious, observable physical actions, or how they distinguish between two actions happening at the exact same time. PROFESSOR: This is where syntactic bootstrapping comes in. Syntactic bootstrapping is a cognitive mechanism where children use the grammatical structure of a sentence—its syntax—to deduce the meaning of an unfamiliar verb. Instead of relying solely on what they see, they use the sentence's form as a linguistic clue. Let me give you a classic experiment that illustrates this beautifully, conducted by Letitia Naigles in 1990. Naigles took two-year-old toddlers and showed them a television screen split in two. On one side of the screen, a duck was actively pushing a bunny down into a squatting position. On the other side, both the duck and the bunny were simply waving their arms in circles, doing the same motion side by side. Now, while the toddlers watched this, they heard a voiceover. One group of children heard: 'The duck is gorping the bunny.' This is a transitive sentence structure—meaning it has a subject acting directly on an object. The other group heard: 'The duck and the bunny are gorping.' This is an intransitive structure, where there is no direct object, just two subjects performing an action together. By the way, 'gorping' is a nonsense verb, completely made up, to ensure the children had no prior knowledge of its meaning. STUDENT: Wait, so how did the researchers know what the kids actually thought 'gorping' meant? They can't exactly explain their reasoning at two years old. PROFESSOR: Excellent question, Tariq. The researchers used a preferential looking paradigm. This is a technique based on the fact that children will look longer at a visual display that matches what they are hearing. When the voiceover said, 'Find gorping!', the children who had heard 'The duck is gorping the bunny' spent significantly more time staring at the side of the screen where the duck was forcing the bunny to squat. They deduced that 'gorping' must mean the causative, transitive action—the pushing. Conversely, the children who had heard 'The duck and the bunny are gorping' looked longer at the side where both characters were waving their arms. They inferred that 'gorping' referred to the coordinated, intransitive motion. What this proves is that the toddlers didn't just look at the physical scene and guess. They used the syntactic frame—the presence or absence of a direct object—to narrow down and choose the correct meaning of the novel verb. They boot-strapped, or pulled themselves up, into the verb's meaning using their existing grasp of syntax. Of course, this doesn't mean semantic bootstrapping is useless. In fact, most modern linguists agree that children likely employ both strategies in tandem, depending on the stage of development and the complexity of the vocabulary they are encountering. [Q23] What is the lecture mainly about?

中文翻译

旁白：听一段语言学课上的讲座片段。 教授：大家早上好。今天，我们将深入探讨发展心理语言学，特别是婴儿是如何习得动词意义的。名词相对来说比较简单直接。父母指着一个杯子说“杯子”，孩子就会把这个声音与眼前的实物联系起来。但动词就棘手得多。当物理世界中充斥着各种同时发生、令人眼花缭乱的动作时，蹒跚学步的幼儿是如何弄清楚像“想”、“给”或“推”这样的词到底是什么意思的呢？几十年来，占主导地位的观点是所谓的“语义自举”（semantic bootstrapping）。语义自举理论认为，儿童利用他们天生的语义范畴知识——比如识别谁是动作的执行者（即“施事”），谁是动作的承受者（即“受事”）——来构建他们母语的基本语法结构。比如，他们看到一只狗在追一只猫，识别出狗是起因或施事者，就会推断“狗”一定是句子中的主语。但这个理论有一个，呃，很大的盲区。它无法完全解释儿童是如何学习那些无法轻易与明显、可观察的物理动作配对的动词，也无法解释他们如何区分两个同时发生的动作。 教授：这就轮到“句法自举”（syntactic bootstrapping）登场了。句法自举是一种认知机制，指儿童利用句子的语法结构（即句法）来推断一个生疏动词的意思。他们不再仅仅依赖眼前的所见，而是将句子的结构形式作为一种语言线索。让我给你们举个非常经典的实验，它完美地说明了这一点，这是由莱蒂西亚·奈格尔斯（Letitia Naigles）在1990年进行的。奈格尔斯找来两岁的幼儿，让他们看一个分裂成两部分的电视屏幕。在屏幕的一侧，一只鸭子正主动把一只兔子往下推，让它蹲下。在屏幕的另一侧，鸭子和兔子只是并排站着，一起绕圈挥舞手臂，做着相同的动作。在幼儿观看这些画面的同时，他们听到了旁白。第一组孩子听到的是：“The duck is gorping the bunny（鸭子正在gorp兔子）。”这是一个及物句型结构，意味着有一个主语直接作用于一个宾语。另一组孩子听到的是：“The duck and the bunny are gorping（鸭子和兔子正在gorp）。”这是一个不及物结构，没有直接宾语，只有两个主语在一起进行某项活动。顺便提一下，“gorping”是一个毫无意义的假词，完全是编造出来的，以确保孩子们之前对它的意思一无所知。 学生：等一下，那研究人员怎么知道孩子们到底认为“gorping”是什么意思呢？两岁的孩子可没办法清楚地解释他们的推理过程。 教授：问得好，塔里克（Tariq）。研究人员使用了“注视时间偏好范式”（preferential looking paradigm）。这种技术基于这样一个事实：孩子们盯着与他们所听到的内容相匹配的画面的时间会更长。当旁白说“寻找gorp！”时，那些听到“The duck is gorping the bunny”的孩子盯着屏幕上鸭子强迫兔子蹲下那一侧的时间明显要长得多。他们推断出“gorping”一定是指那个具有因果关系的、及物性的动作——也就是“推”。相反，听到“The duck and the bunny are gorping”的孩子则盯着两个角色都在挥舞手臂那一侧的时间更长。他们推断“gorping”指的是那个协同的、不及物性的动作。这证明了幼儿并不仅仅是看着物理场景瞎猜。他们利用了句法框架——即是否存在直接宾语——来缩小范围并选择新动词的正确含义。他们利用自己已掌握的句法知识，“自举”或提升了自己对动词意义的理解。当然，这并不意味着语义自举毫无用处。事实上，大多数现代语言学家都同意，儿童可能会根据其所处的发展阶段和所遇到的词汇复杂度，将这两种策略结合起来使用。

(Shared with Q23.) [Q24] According to the professor, what is a limitation of semantic bootstrapping?

中文翻译

（与第23题共用音频。）[第24题] 根据教授的说法，语义自举的局限性是什么？

(Shared with Q23.) [Q25] In the experiment described by the professor, what did the children see on the split screen? Choose 2 answers.

中文翻译

（与第23题共用音频。）[Q25] 在教授描述的实验中，孩子们在分屏上看到了什么？请选择2个答案。

(Shared with Q23.) [Q26] Why does the professor mention the preferential looking paradigm?

中文翻译

（与第23题共享音频。）[第26题] 教授为什么要提到“偏好注视范式”？

(Shared with Q23.) [Q27] What does the professor imply about the relationship between semantic bootstrapping and syntactic bootstrapping?

中文翻译

（与第23题共用。）[第27题] 关于语义自举和句法自举之间的关系，教授暗示了什么？

(Shared with Q23.) [Replay: "By the way, 'gorping' is a nonsense verb, completely made up, to ensure the children had no prior knowledge of its meaning."] [Q28] Why does the speaker say this:

中文翻译

（与第23题共用。）[重放：“顺便提一下，‘gorping’是一个毫无意义的动词，完全是编造出来的，目的是为了确保孩子们此前对它的含义一无所知。”]