托福TPO44听力Lecture真题解析

TPO，即toefl Practice Online的首写字母，就是托福在线练习的意思，TPO可以为考生提供全真的模拟考试环境和过往真题，而TPO题库也是有着不断的更新。在托福听力备考中，想要快速提升自己的托福听力能力，选择好适合的练习材料是个非常重要的环节。而对于很多备考托福的学生来说，TPO往往就是一个首先的备考材料。今天，小编就为大家带来托福TPO44听力Lecture真题解析。

托福TPO44听力Lecture1  【在线咨询】

1. What is the main purpose of the lecture? 【内容主旨题】
A. To provide an example of a practical use of nanotechnology.
B. To show the origins of the field of nanotechnology.
C. To give a brief outline of the main concepts of nanotechnology.
D. To explain the growing interest in nanotechnology research.
答案：A

解析：(从20秒开始，原文重现：So, I want to talk about how nanotechnology is being used today. And just to give you an idea, we’ll look at one particular application.)
教授提到要探讨纳米技术如今是如何被运用的，并通过一个特别的运用来了解。
选项A的an example of a practical use与原文意思一致，通过例子来解释纳米技术的运用，故选项正确; B未提及纳米技术的起源origins; C的a brief outline一个简短的概述在原文中未被提及;D的growing interest逐渐增长的兴趣在原文中也未被提及。

2. How does the professor organize the information he presents to the class? 【组织结构题】
A. He describes the inspiration behind the nanocoating, then how the coating works.
B. He describes how the nanocoating is currently marketed, then the inspiration behind it.
C. He explains how fogging occurs, then the basic concepts of nanotechnology.
D. He explains how fogging occurs, then how the nanocoating prevents it.
答案：D

解析：(从54秒开始，原文重现：Now, fogging often occurs when a cold surface comes into contact with warm moist air, such as when a glass shower door or mirror fogs up during a warm shower.
Now, what's actually happening is, what the fog is, is thousands of tiny spherical water droplets condensing on the surface of the glass. Light hits the water droplets and is scattered in random directions, causing the fogging effect.
Now, the kind of spray-on treatments I mentioned. Well, they wear off. What happens is they cause the tiny water droplets to flatten when they condense on the surface of the shower door or bathroom mirror or whatever object it is, it's been applied to.)
教授讲了雾化发生的条件并解释了什么是雾化，并提出了防止雾化的方法。
选项A中纳米涂层的启发未被提及;选项B纳米涂层是如何被推广的在原文中并未被提及;选项C前半句的雾化是怎么形成的和原文结构一致，后半句讲的纳米技术的基本概念并未被提及;选项D教授解释了雾化是如何发生的接着讲了纳米涂层是如何防止它的，与原文的结构一致，选项正确。

3. According to the professor, how does the new nanocoating work? 【细节题】
A. By forcing light to bounce off a glass-coated polymer.
B. By forcing water droplets to roll off an ultrathin surface.
C. By causing water droplets to merge into a single sheet of water.
D. By causing light to scatter randomly in many directions.
答案：C
破题关键词汇：new nanocoating

解析：(从2:34秒开始，原文重现： The coating prevents fog from developing, because it loves water. It attracts the water droplets, sucking them into the tiny pores. And that alters the shape of the droplets. The droplets are forced to flatten and to join together into a single sheet of water, rather than remaining as single droplets, each of which is a sphere that scatters light in different directions.)
原文里教授讲涂层是如何防止雾化发展的。选项A的light在原文的细节中并未被提及;选项B的迫使水滴从极薄的表面滚落，原文的细节是水滴被压平并聚集成一片水，选项错误;选项C使水滴聚集成一片独立的水，与原文细节一致;选项D中提到light随机散射在不同的方向，选项错误。

4. According to the information in the lecture, why does the new nanocoating not last as long on plastic as it does on glass? 【细节题】
A. Plastic cannot withstand extremely high temperatures.
B. The internal structure of plastic repels a positively charged polymer.
C. The coating solution scatters when it comes into contact with plastic.
D. Plastic surfaces scratch more easily than glass surfaces do.
答案：A
破题关键词汇：not last on plastic, glass

解析： (从3:29秒开始，原文重现： But that's possible only on materials that can withstand high heat. Glass? Yes. Plastics? No. But they’re working on solving that problem, trying to come up with a way to coat plastics and other materials, durably and effectively.)
教授讲到材料要能耐高温，并提到玻璃是可以的，塑料是不可以的。选项A明确提到塑料不能耐极高的温度，与原文一致;选项B并未讲到塑料内部结构，选项错误;选项C当接触到塑料涂层解决方案分散了，在原文中并未被提及;选项D比起玻璃表面，塑料表层更容易刮擦，原文并未对两者进行比较。

5. What inspired the team of scientists in developing the new coating? 【细节题】
A. A problem the team frequently encountered in everyday life.
B. The ineffectiveness of spray solutions in flattening water droplets.
C. The leaves of a plant that the team had been investigating.
D. Interactions observed between silica nanoparticles and polymers.
答案：C
破题关键词汇：scientists

解析： (从3:47秒开始，原文重现： Interestingly, it was a plant, the lotus plant that inspired this work. I guess you could say inspired it in an indirect sort of way. The leaves of this plant are what we call superhydrophobic. Lotus leaves, being superhydrophobic, don't attract water. They repel it, in a big way. When raindrops fall on lotus leaves, they remain spherical. They roll right off.)
教授提到是莲花这种植物用间接的方式启发了他们的工作。选项A科学家团队在每天的生活中碰到的一个问题，在原文这并没有提到这个细节;选项B中的spray solutions喷雾液并没有被提及;选项C科学家土堆一直在研究的植物的叶子，与原文讲的莲花这个植物的叶子细节一致，选项正确;选项D中的silica二氧化硅和polymers聚合物之间的反应在原文中并未被提及。

6. What is the professor's opinion about the approach inventors took to the development of the new nanocoating? 【态度题】
A. He thinks other inventors should use a similar approach.
B. He is impressed by the flexibility of their approach.
C. He is surprised the research process took so long.
D. He thinks they should have spent more time testing a superhydrophobic coating.
答案：B
破题关键词汇：new

解析： (从4:17秒开始，原文重现： So for a long time, the Massachusetts scientists tried to create a coating that acted like these lotus leaves, a coating that was superhydrophobic. But then they began to think about the opposite extreme. Could they accomplish their goal by making a coating that, instead of repelling water, actually, attracted water?)
教授讲很长一段时间科学家们试图发明一种涂层像莲花的叶子一样疏水，但接着他们开始考虑相反的极端，就是吸水的涂层。选项A提到的是别的发明者应当用一个相似的方法，与原文相悖;选项B教授对他们灵活的方法印象深刻，与原文中提到的两种相反的灵活方法意思一致;选项C教授并未对长时间的研究过程感到惊讶;选项D在原文中教授并未提及对测试超疏水的涂层多花点时间。

托福TPO44听力Lecture2     【在线咨询】

1. What is the lecture mainly about? 【内容主旨题】
A. The dramatic structure of an ancient Greek play.
B. The influence of ancient Greek theater design on modern theaters.
C. The design of ancient Greek theaters.
D. The role of plays in ancient Greek society.
答案：C

解析： (从5秒开始，原文重现： Now, throughout the history of drama, there has been a, well, a relationship between the structure of a play, and the structure of the space where the play was performed. And this goes all the way back to the ancient Greeks.)
教授开篇指出在整个戏剧的历史长河中，在剧本的结构和戏剧被表演的空间结构之间是有关系的，这要追溯到古希腊时期。选项A讲的是古希腊的戏剧结构，与原文主旨不符;选项B古希腊剧院的设计对现代剧院的影响，在原文开篇的主旨中并未被提及;选项C古希腊剧院的设计，与原文相符;选项D戏剧在古希腊社会中起到的作用，在开篇并未被提及。

2. What were two purposes served by the skene? Click on 2 answers.【细节题】
A It provided extra seating for the audience.
B It served as the location for the play’s action.
C It was used to store items needed for the play.
D It was where the chorus performed.
答案：BC
破题关键词汇：Skene

解析： (从1:13秒开始，原文重现： Um, so, anyway, the skene started as a simple wooden platform, but eventually became much more elaborate. The front wall of the building was decorated like a palace, or a temple, and served as background scenery for the play. The building was also a storage place for costumes, props, things like that.)
原文中提到skene从简单的木舞台发展成精心制作的舞台，被当作表演背景，同时也是储藏演出服、道具的场地。选项A中给观众额外的座位extra seating，完全错误;选项B作为表演的场地，与原文一致;选项C它被用来储存演出物品，与原文细节相符;选项D是合唱团chorus表演的地方，在原文中并未被提及。

3. Why is the play Hippolytus discussed? 【组织结构题】
A. To give an example of a strategy used by ancient Greek playwrights.
B. To give an example of how animals were used in ancient Greek plays.
C. To identify the first use of a messenger in an ancient Greek play.
D. To point out that ancient Greek plays typically involved tragic events.
答案：A
破题关键词汇：Hippolytus

解析： (从1:55秒开始，原文重现：Professor: Some events couldn't be presented convincingly, so the playwrights had them take place somewhere off stage, where the audience couldn't see them. And then news of the event would be reported by one of the characters. Diane?
Student: Last summer, I saw... Hippolytus.)
原文中教授先说一些事件不能让人信服地所呈现，所以剧作家没有让其发生在舞台上，观众们就看不到它们，接着学生根据教授的问题提到了Hippolytus来印证。选项A通过故希腊剧作家的一个策略的来例证，与原文用意相符;选项B为了给出在古希腊戏剧中动物是如何被表现的例子，与原文用意不符;选项C中的first use of a messenger在原文中没有被提到;选项D的涉及tragic events悲剧的细节在原文中并未被提及。

4. What point does the professor make about the chorus in ancient Greek plays? 【细节题】
A. It performed only at the beginning of the play.
B. It interpreted what was happening on the stage.
C. It did relatively little singing and dancing.
D. it was less important than it is in modern plays.
答案：B
破题关键词汇：chorus

解析： (从2:49秒开始，原文重现： Um, in ancient Greek, the word orchestra actually meant the dancing place, because this is where the chorus danced and sang.)
原文提到在古希腊orchestra事实上意为跳舞的地方，因为这是chorus跳舞和唱歌的地方。选项A中chorus只在戏剧的开头表演，这在原文中并未被提及;选项B中解释了在舞台上发生了什么，与原文中提到的是唱歌和跳舞的地方意思相符;选项C与唱歌和跳舞没太大关系，显然与原文意思相悖;选项D中并没有提到古希腊的chorus没有现代重要。

5. How did Aristotle view the chorus? 【细节题】
A. As the author of the play.
B. As a distraction from the story.
C. As a messenger reporting news.
D. As a character in the play.
答案：D
破题关键词汇：Aristotle

解析： (从3:19秒开始，原文重现： Professor: In fact, Aristotle, the Greek philosopher, thought the chorus should be considered as acting out a role in the play.
Student: Yeah, I read that a chorus could have a distinct personality, just like a person.)
教授讲古希腊哲学家Aristotle亚里士多德认为chorus合唱团应该被视为在句中扮演一个角色，接着学生肯定他所了解一个合唱团可以有一个鲜明的个性就像一个人。选项A中作为戏剧的作者，原文中Aristotle并没有把chorus当成作者;选项B中分散故事注意力，原文中并未提及;选项C作为报道新闻的传递者，在原文中无处可寻;选项D作为戏剧中的一个角色，与原文Aristotle的想法一致。

6. Why does the professor say this: 【重听题】
A. To emphasize the popularity of plays in ancient Greece.
B. To praise the creativity of the ancient Greeks.
C. To point out that every seat in an ancient Greek theater had a clear view of the stage.
D. To suggest that audiences in ancient Greece could hear plays better than they could see them.
答案：D

解析： (从4:01秒开始，原文重现：The shape of the bowl captured sound and funneled it upwards so that even in the top rows, spectators were able to hear the performers very clearly.
Actually, that the name theatron means seeing place is kind of ironic. Some theaters had fifty or more rows of seats accommodating up to 14,000 spectators, ascending way up the hillside, and this was long before theater binoculars were invented.)
重听部分讲到一些影院有50排或更多的座位可容纳高达14,000的观众，以山坡的形式向上倾斜，并且这是在望眼镜被发明之前就有。选项A中为了强调古希腊戏剧的流行，与原文意思不符;选项B为了赞扬古希腊人的创意，与原文不符;选项C为了指出在古希腊的剧院中每个座位看舞台都有一个清晰的视野，只是原文的其中一个用意;选项D为了表明比起看来说，古希腊的观众可以更好地听到戏剧的声音，与原文前面spectators were able to hear the performers very clearly所呼应。

托福TPO44听力Lecture3  【在线咨询】

1. What is the lecture mainly about? 【内容主旨题】
A. The spread of early agricultural methods from New Guinea to other cultures.
B. Differences in the types of crops grown in early centers of agriculture.
C. Evidence supporting the theory that agriculture developed independently in New Guinea.
D. Techniques used by researchers to identify farming methods in the earliest centers of agriculture.
答案：C

解析： (从30秒开始，原文重现：Now, for many years archaeologists have speculated that agriculture also arose independently in another center, too—New Guinea, which is just north of Australia, in the South Pacific Ocean. You can see it on this map.)
教授开篇指出之前讲的早期文明是如何发展的，接着提出考古学家推测农业也在其他地方独立出现New Guinea,在澳洲的北部，南太平洋，接下去都是围绕着此观点展开。选项A中early agriculture methods早期的农耕方式是之前讨论的;选项B作物生长方式的不同在原文中并未被提及;选项C用证据证明农业独立在New Guinea发展的理论，与原文意思相符;选项D中farming methods在原文中并未被提及。

2. According to the professor, why was the archaeological evidence found in New Guinea during the 1960s and 1970s inconclusive? Click on 2 answers. 【细节题】
A Construction of agricultural drainage ditches had damaged much of the archaeological evidence.
B Plant remains were not well preserved in the climate of New Guinea.
C Ancient types of domestic plants were no longer grown by modern farmers.
D It was unclear whether evidence of early deforestation suggested planting or hunting.
答案：BD
破题关键词汇：1960S and 1970s, inconclusive

解析： (从1:05秒开始，原文重现：Then in the 1960s and 70s, research was conducted at sites in New Guinea to explore the possibility of independent agricultural development. But unfortunately, the evidence gathered at that time was inconclusive.
For instance, although evidence was found of deforestation, you know, cutting down trees, from at least 7,000 years ago, that is long before we'd thought previously. It was unclear whether the forest had been cleared by farmers to plant fields, or by hunter- gatherers, so they could hunt more easily. And many plant remains like seeds and fruits don't preserve well in swampy soils, in humid environments like you often find in New Guinea. So really, the proof was limited.)
通过关键词很容易可以定位答案出现的位置，通过For instance, 可知早期的森林退化，不确定是否被农户或狩猎者清理，并且很多保存的种子和果实在湿地里不能很好的保存。选项A中的drainage ditches排水沟在原文中并没有被提及;选项B由于New Guinea的气候作物不会很好的保存，与原文的细节一致;选项C中的古代domestic plants当地作物的种类不在被如今的农户所种植，原文中并未提及此细节;选项D不确定是否早期的森林退化会显示种植或狩猎，与原文细节信息一致。

3. Why does the professor talk about layers of soil? 【组织结构题】
A. To show how phases of agricultural development were linked to evidence of population growth. B. To describe how researchers identified several phases of agricultural development in New Guinea.
C. To illustrate how swampy conditions cause archaeological remains to deteriorate.
D. To describe one of the methods of farming used at Kuk.
答案：B
破题关键词汇：layers of soil

解析： (从2:10秒开始，原文重现：Based on their findings, they identified a succession of phases of agricultural development in the wetlands there, with several of these phases predating the earliest known agricultural influence from Southeast Asia. At the site in Kuk, they used an array of modern archaeological methods to analyze sediment samples from the soil…The second phase, which they identify from a higher layer of soil, featured regularly distributed mounds…And in the layers from Kuk's third phase, they found evidence of an extensive network of ditches and drainage channels, indicating a further refinement of wetland cultivation.)
教授先阐述观点，在用三个不同层次的土壤分别含有的物质的例子进行证明。选项A中的population growth人口增长在原文中并没有提及与之相关的信息;选项B为了描述研究者如何证明在New Guinea不同阶段的农业发展, 与教授用三个不同层次的土壤所发现的物质所证明的信息相符;选项C中swampy conditions只是其中一层土壤的细节信息;选项D在Kuk用的一种农耕方式，只是其中的一个细节信息。

4. Why did researchers conclude that the taro remains found near Kuk were a result of farming? 【细节题】
A. Taro does not grow wild in highland areas.
B. Taro is a native plant of China.
C. Taro was only found in a very small area near Kuk.
D. Taro normally does not grow in wet climates.
答案：A
破题关键词汇：taro

解析： (从3：57秒开始，原文重现： Finding the taro remains were very important, because it meant that it must have been planted there, brought from the lowlands, because taro doesn't grow naturally in the highlands.)
原文提到taro芋头的发现非常重要，因为意味着它已经种下了，来自于低洼，因为taro不能自然地在高地生长。选项A中taro不能再高地区域野生生长，与原文信息一致;选项B中提到的China在原文中并未被提及;选项C中taro仅在Kuk附近一小片区域被发现，在原文中未被提及;选项D中wet climates潮湿的气候在原文中未被提及，原文讨论的是高或低的地方。

5. What evidence indicated that bananas were being cultivated in New Guinea during an earlier period than was previously thought? Click on 3 answers. 【细节题】
A High concentrations of fossil remains of bananas.
B The discovery of stone tools designed to harvest bananas.
C The presence of regularly distributed mounds.
D Indications that Kuk did not become a swampy wetland until approximately 7,000 years ago.
E Genetic analyses of banana remains in New Guinea and Southeast Asia.
答案：ACE
破题关键词汇：banana

解析： (从4:08秒开始，原文重现： And as for the bananas, researchers also found a high percentage of fossils from banana plants in sediment samples dating from about 7,000 years ago, proof the bananas were deliberately planted, because where bananas grow naturally the concentration of the plant fossils is lower. Bananas don't naturally grow so densely. As a matter of fact, recent genetic research, genetic comparisons of banana species, suggests that the type of banana grown in New Guinea was domesticated there and then brought to Southeast Asia.)
原文中提到研究者发现来自于香蕉的大部分化石可追溯到7000年前，可以证明香蕉是有意地被种植，自然生长的香蕉形成的化石堆比较低。香蕉不会如此密集地生长，事实上通过香蕉物种的基因对比，可以证明在New Guinea的香蕉是本地产的并被传到东南亚。选项A中化石中保存的香蕉与原文信息一致;选项B中stone tools收割香蕉，在原文中并未被提及;选项C中定期地生长会形成堆，与原文信息相符;选项D中的Kuk在7000年前是不是swampy wetland与原文信息不符;选项E中提到的对New Guinea和东南亚的香蕉进行基因分析与原文信息相符。

6. What point does the professor make about the theory that agriculture brings about social change? 【细节题】
A. Recent research has yielded unexpected evidence supporting the theory.
B. The theory seems to be contradicted by the development of society in New Guinea.
C. Future discoveries in Kuk are likely to provide definitive proof for the theory.
D. The theory explains why New Guinea has become an egalitarian society.
答案：B
破题关键词汇：social change

解析： (从4:50秒开始，原文重现： Well, usually, we expect to see that certain social changes are brought about by the development of agriculture, structural changes in the society like rapid population growth, different social classes. But New Guinea, it's largely unchanged. It's remained an egalitarian and rural society, so what does that tell us about the usual assumption?)
原文中教授说通常我们期望看到某些社会变化是由迅速增长地人口，不同的社会阶级所导致的，但是New Guinea则很大程度上没有变化，它还是保留着平等和原始的社会。选项A中unexpected evidence在原文中无体现;选项B中提到New Guinea的社会发展与通常的理论所相悖，与原文信息相符。

托福TPO44听力Lecture4     【在线咨询】

1. What is the main purpose of the talk? 【目的主旨题】
A. To explain the mechanical functioning of barrages.
B. To discuss some possible ecological effects of building barrages.
C. To discuss the effects of ocean tides on coastal ecosystems.
D. To describe ways to increase biological productivity of estuaries.
答案：B

解析： (从29秒开始，原文重现：There is currently a lot of interest in harnessing the power of the oceans, of the ocean tides…One place where this tidal energy can be harnessed is at a shallow body of water, such as an estuary…And one way to harness that energy is by building a structure called a barrage there…)
教授开篇提出如今对海洋能源来产新能源，费用不高还节能环保，接着提出在入海口修建大坝能实现。选项A解释大坝的功能不是此篇主要目的;选项B讨论一些可能修建大坝的生态效应，与原文用意一致;选项C讨论海浪对海岸生态系统的影响，不是主要目的;选项D为了描述增加入海口生物生产力的方法，与原文不符。

2. What is the professor's opinion when the man expresses concern about marine life on the mud flats? 【态度题】
A. She thinks the environmental impact of barrages would be worse for birds than for fish.
B. She agrees that any damage to the mud flats would probably be irreversible.
C. She feels that the situation is more complex than the man realizes.
D. She does not believe that the mud flats support a wide variety of animal species.
答案：C
破题关键词汇：marine life, mud flats

解析： (从2:29秒开始，原文重现：Student: But don't lots of birds rely on exposed mudflats for food? I mean, don't they eat tiny animals that live in the mud? And what about those tiny animals? What would happen to them if the mudflats were endangered?
Professor: So you are seeing some of the potential problems with the barrage. But consider this, right now, the water in an estuary is very cloudy. The tidal currents are constantly churning up the sediments that rivers deposit in the estuary. But a barrage would reduce the tidal currents. So a lot of that sediment would settle to the floor of the estuary.)
原文中学生提出如果泥摊受影响的话，海洋生物将会随之受牵连。接着教授说这只是大坝潜在的问题，但大坝也会减少潮汐。选项A教授认为大坝的环境影响，比起鱼来说鸟的更为严重。原文并没有对鱼和鸟的环境进行比较;选项B她同意任何对泥滩的破坏都将可能是不可避免的，不是教授的想法;选项C她认为比起男生的担忧处境更复杂，与原文意思相符;选项D她认为泥滩不会有不同的动物物种，与原文不符。

3. The professor mentions a change in the quantity of fish caught near a barrage in France. What most likely happened to the water in the estuary as a result of the construction of the barrage? 【推断题】
A. The water has become clearer.
B. The water has become saltier.
C. The water has become polluted
D. The water level has risen.
答案：A
破题关键词汇：fish, France

解析： (从3:22秒开始，原文重现： Yes, there are several in operation. There is one in France. Now, they have to be careful there about how they turn on the turbines because they create currents and waves that can affect boats. But I haven't read about any major ecological problems. In fact, the fishing is supposed to have improved. Plus there is even more bird life.)
原文中教授提到法国的一个大坝如今对如何发动涡轮非常小心，因为它产生的潮汐会影响船，对生态的影响尤其是鱼和鸟都十分有利。这些与前面教授的观点相呼应。选项A水变的更干净，通过原文中的鱼的生态环境改进了可以推断出水质变好了;选项B水变的更咸了，与原文推断不符;选项C水受的污染更严重了，也与原文推断不符;选项C水平面升高了，在原文中并未被提及。

4. What does the professor say is a criticism of the proposed barrage at the Severn River in Great Britain? 【细节题】
A. It would damage nearby buildings.
B. It would attract harmful species to the region.
C. It would not be as large as the barrage in France.
D. it would be too expensive to build.
答案：D
破题关键词汇：Severn River，Great Britain

解析： (从3:44秒开始，原文重现：There has been one proposed for the estuary of Great Britain's Severn River, one of the largest estuaries in the world…Critics say that it would better to use that money for something else, such as improving the energy efficiency of buildings. You could make a lot of buildings more efficient with all that money and that would reduce the need for electricity.)
原文中提到将在Severn River全球最大的入海口建大坝，除了环境因素的考虑，这个工程将会斥巨资建造，很多人批判说那些钱应该用在如高效节能上。选项A中将破坏周围的建筑，与原文不符;选项B将会吸引有害的物种，与原文不符;选项C不会和法国的大坝一样大，不是原文中所批判的内容;选项D建造的花费太贵，与原文信息相符。

5. Why does the professor say this: 【重听题】
A. To request that the student answer in greater detail.
B. To introduce a new topic for discussion.
C. To make the student's statement more accurate.
D. To repeat a point that she had not stated clearly.
答案：B

解析： (从57秒开始，原文重现： Student：An estuary is where a river enters the ocean. The fresh water meets the ocean water. Sometimes it is covered in water. Sometimes it is not.
Professor：Some parts of the estuary, as the tides go in and out, but other parts are always submerged.)
原文中学生讲到入海口是河流汇入海洋，淡水汇入海水的地方。有时被水覆盖有时则没有。教授接着说入海口的一些部分，由于潮汐涨退，但有些部分总是被淹没的。选项A要求学生的答案在更详细些，与原文不符;选项B为了介绍一个新的话题去讨论，与原文意思相符;选项C为了让学生的阐述更准确，与原文无关;选项D为了重复一个她没有陈述清楚的观点，与原文无关。

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