托福TPO38聽力Lecture真題解析

TPO，即toefl Practice Online的首寫字母，就是托福在線練習(xí)的意思，TPO可以為考生提供全真的模擬考試環(huán)境和過往真題，而TPO題庫(kù)也是有著不斷的更新。在托福聽力備考中，想要快速提升自己的托福聽力能力，選擇好適合的練習(xí)材料是個(gè)非常重要的環(huán)節(jié)。而對(duì)于很多備考托福的學(xué)生來說，TPO往往就是一個(gè)首先的備考材料。今天，小編就為大家?guī)�來托福TPO38聽力Lecture真題解析。

托福TPO38聽力Lecture1  【在線咨詢】

1. What does the professor mainly discuss?
A. Techniques for breeding unusual varieties of tulips in the Netherlands.
B. New types of plants introduced to Europe through trade.
C. The spread of plant diseases throughout seventeenth-century Europe.
D. The impact of a plant virus in the Netherlands in the seventeenth century.
答案：D選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Professor:
Okay. Let's move on, to bacteria and viruses that can infect plants. And let's start out with a virus that's rather common in various plants but first became known in connection with tulips.
這一句點(diǎn)明了教授接下來要講的東西：一種在各種植物里很平常的、但是因?yàn)樗�和郁金香的�?lián)系而出名的病毒。選項(xiàng)D符合原文意思。其余三個(gè)選項(xiàng)則沒有很好概括。選擇D。

2. What opinion does the professor express about color breaking in tulips?
A. It probably occurred more often in the seventeenth century than it does today.
B. It was not as rare in the seventeenth century as botanists believed.
C. It influenced the behavior of many people in the Netherlands.
D. It will probably never be duplicated through controlled breeding.
答案：C選項(xiàng)正確

解析：本題出題點(diǎn)在于：Tulip flowers with stripes or streaks or feather or flame patterns on their petals, there is no doubt in my mind that these symptoms of this breaking virus affected human behavior too indirectly, that they set off the famous tulip craze in the Netherlands. 這種病毒會(huì)導(dǎo)致郁金香的花瓣上 出現(xiàn)條狀的、羽毛樣的或者煙狀的圖案，就是這種特殊的變異導(dǎo)致人們對(duì)于郁金香變得瘋狂。選項(xiàng)C符合原文。其余三個(gè)選項(xiàng)不符合。選擇C。

3. According to the professor, what is one reason that the Dutch started cultivating tulips?
A. There was an increase in trade between the Netherlands and Persia.
B. There were plans to open a new botanical garden in the Netherlands.
C. Wealthy individuals wanted to show that they could afford expensive merchandise.
D. Dutch botanists became skilled in crossbreeding plants.
答案：C選項(xiàng)正確

解析：本題出題點(diǎn)在于：In the 17th century, the Netherlands was among the most important trading centers in all of Europe with lots of rich merchants who wanted to showcase their wealth, for example, by displaying exotic tulips in their private gardens. 在17世紀(jì)，荷蘭成為了全球有名的貿(mào)易中心之一，很多有錢的商人為了顯擺自己的財(cái)富，特地去把昂貴的郁金香種在自己私人花園里。選項(xiàng)C說有錢人想證明自己可以買的起很貴的郁金香這種商品，正確。其他三個(gè)選項(xiàng)則沒有原文依據(jù)。選擇C。

4. Why does the professor mention a turban worn by some men?
A. To offer an explanation for how the tulip got his name.
B. To emphasize the unique color patterns of some tulips.
C. To explain why the tulip was considered an exotic flower in Europe.
D. To describe differences between Dutch tulips and Persian tulips.
答案：A選項(xiàng)正確

解析：本題出題點(diǎn)在于：There's an explanation for the origin of the name "tulip" that kind of reflects this. Apparently, it came from a Persian word for "turban", you know, a cloth wound round the head. Um, a style of headgear worn by men in that part of the world. 這里提到了turban。意思是郁金香的名字來源于turban，是一種圍在頭上的布料，是那個(gè)地區(qū)的男人會(huì)帶的一種帽子。這里提到turban就是為了解釋郁金香的名字的來源。選項(xiàng)A正確。其余三個(gè)選項(xiàng)不合適。選擇A。

5. According to the professor, what characteristic of tulips aided the spread of tulip cultivation?
A. Tulips grown from seeds produce bulb within a year.
B. Tulip bulbs can be removed from the ground and stored.
C. Tulips adapt easily to different kinds of soil.
D. Tulips are relatively resistant to plant viruses.
答案：B選項(xiàng)正確

解析：本題出題點(diǎn)在于：And since these bulbs remain viable for quite a long time, even out of the ground, they can be stored or transported long distances without much of a problem, which helps explain the spread of tulip cultivation. 這里提到，郁金香的花苞可以在摘下來很長(zhǎng)時(shí)間以后都存活著，而且可以被儲(chǔ)存和運(yùn)輸很長(zhǎng)距離，這就讓郁金香的移植變得有可能。選項(xiàng)B符合這一段的意思。其他三個(gè)選項(xiàng)不符。選擇B。

6. According to the professor, what factors contributed to a dramatic rise in the prices of some tulips in the early seventeenth century?
Click on 2 answers
A. Botanists discovered how to breed tulips that were resistant to certain plant diseases.
B. The demand for tulips increased in Persia and the Ottoman Empire.
C. Dutch speculators enthusiastically bought tulip bulbs as investments.
D. The most desirable tulips could not be produced by breeding at that time.
答案：CD選項(xiàng)正確

解析：本題出題點(diǎn)在于：And the tulips most prized for their uniqueness and beauty were apparently the ones inflected by this mysterious virus. At that time, nobody was really able to breed tulips like these. Color breaking happened in just two or three out of a hundred bulbs and seemingly just by chance.和 And since you didn't really know when you bought a bulb if the colors would break, well, Dutch speculators invested hand over fist and drove prices sky high. 本題問郁金香的價(jià)格泡沫的原因。這一段提到，因?yàn)橛艚鹣銜?huì)因?yàn)椴《径�展示出稀少漂亮的美，而且這種變種很難人工繁殖，只能看運(yùn)氣;還有因?yàn)椴恢�道自己買的郁金香會(huì)不會(huì)產(chǎn)生這種顏色的break，所以荷蘭的投資者會(huì)投資它，炒高它的價(jià)格。這兩句話分別對(duì)應(yīng)選項(xiàng)D和選項(xiàng)C。其余兩個(gè)選擇不符合原文意思。雙選CD。

托福TPO38聽力Lecture2  【在線咨詢】

1. What is the lecture mainly about?
A. The advantages of congruent over incongruent media for advertising cars.
B. The advantages of using magazines over television as an incongruent advertising medium.
C. How incongruent media can be used for effective advertising.
D. How advertising using only one type of media can increase brand awareness.
答案：C選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Now, there's another approach, that's placing ads in incongruent media.
這篇文章的引入部分比較長(zhǎng)。從開頭就一直在講一致的媒體的廣告是什么，以及其優(yōu)勢(shì)。直到這一句話，教授開始講不一致媒體上的廣告的作用。選項(xiàng)C符合。其余三個(gè)選項(xiàng)不符。選擇C。

2. According to the professor, what is one of the advantages of placing an advertisement in congruent media?
A. Consumers process the information more carefully than they would if it appeared in other media.
B. The advertisement is seen by consumers who would be most interested in the product advertised.
C. Consumers can easily compare the product advertised with its competitors.
D. Consumers are repeatedly exposed to the advertisement.
答案：B選項(xiàng)正確

解析：本題出題點(diǎn)在于：
First, it's obvious that people reading a car magazine are interested in cars. So if you place a car ad there, you know you are reaching the right audience. Also, research shows that when people read an ad in a congruent medium, afterwards, they have pretty good recall of what was advertised. 這里提到了一致性廣告的兩個(gè)優(yōu)點(diǎn)。比如一個(gè)看汽車雜志的人很有可能會(huì)買汽車，所以投放一致性廣告會(huì)讓更多的潛在消費(fèi)者看到。第二點(diǎn)是在一致性媒介上看到廣告的人更容易回憶起廣告內(nèi)容。選項(xiàng)B符合了第一條優(yōu)點(diǎn)。其余三個(gè)選項(xiàng)則沒有符合。選擇B。

3. Why does the professor mention car buyers who subscribe to more than one magazine?
A. To emphasize the importance of product design in appealing to readers with different interests.
B. To emphasize the importance of keeping a marketing strategy up-to-date.
C. To give an example of how marketing can expand a magazine's readership.
D. To show why marketers need to research overlapping interests.
答案：D選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Professor:
Well, keep in mind that potential car buyers don't read only car magazines. Most have other interests. Many of them probably subscribe to other magazines, a news weekly, a financial publication, something related to a special interest or hobby. So what marketers have to do then is carefully research potential customers and look for overlapping interests, which magazine overlaps most with the interests of the car buyer. 這里談到了，潛在的某種商品的消費(fèi)者很可能同時(shí)訂閱幾種雜志，所以有的時(shí)候我們需要知道他們交叉訂閱所覆蓋的興趣范圍，找到這一種交錯(cuò)覆蓋的雜志來投放廣告。選項(xiàng)D符合意思。其余三個(gè)選項(xiàng)則不符。選擇D。

4. The professor describes a research study in which advertisements for a car were placed in a cooking magazine. What did the researchers find?
A. Readers paid attention to the advertisements because the product advertised did not match the magazine's theme.
B. Readers' attention to the advertisements varied depending on the location of the advertisements in the magazine.
C. Readers formed a negative attitude toward the car that was advertised.
D. Readers' responses to the cooking articles were not affected by the presence of car advertisements.
答案：A選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Professor:
Now this study suggests that because the people reading a cooking magazine didn't expect to see a car ad, they actually paid more attention. And so for example, when people who like reading about cars see a car ad in a car magazine, they might pass over it quickly, while here...
Student:
They actually took more time to read the ad.
這里說明，一個(gè)研究，研究閱讀烹飪雜志的人突然看到一個(gè)賣車的廣告，他會(huì)更加注意這個(gè)廣告，因?yàn)檫@個(gè)廣告的出現(xiàn)是在他的預(yù)設(shè)之外的。因?yàn)槲覀円话阒粫?huì)期待在烹飪雜志上看到烹飪廣告而不是車這種沒多大聯(lián)系的廣告，突然出來一個(gè)車的廣告，大家都會(huì)很驚訝，印象深刻。選項(xiàng)A符合意思。其余三個(gè)選項(xiàng)不符。選擇A。

5. Why does the professor describe two types of car advertisements in a magazine for new parents?
A. To compare the common features of advertisements in congruent and incongruent media.
B. To compare the reactions of older and younger readers when they see a particular product.
C. To point out that a medium that is too incongruent with a product will not reach potential buyers of that product.
D. To point out that magazines are the most effective type of incongruent medium for placing advertisements.
答案：C選項(xiàng)正確

解析：本題出題點(diǎn)在于：
But there are limits to how incongruent the media should be. You don't want a totally mismatch. So in a magazine aimed at new parents, you often see car advertisements since parents buy and drive cars. But there are different types of cars, right? For example, placing an ad here for a big roomie van, which is popular with big families would make sense, but a snappy sports car with only two seats? Well, that would clearly be too much of a mismatch. 這里教授指出，不一致的媒體也不一定一直會(huì)對(duì)廣告商品的營(yíng)銷產(chǎn)生好的作用。比如對(duì)于一款想賣給新婚夫婦的車，廣告上放一款大容量的家用廂式車和只能坐兩個(gè)人的小跑車是不一樣的。新婚夫婦就不大可能去買后者。選項(xiàng)C符合。其余三個(gè)選項(xiàng)不符合。選擇C。

6. What does the professor mean when she says this:
A. She does not agree with the conclusions of the study.
B. Different research studies have led to conflicting conclusions.
C. The student's conclusion is only partly correct.
D. The student's conclusion applies to congruent, but not incongruent, media.
答案：C選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Student:
So according to the study, basically when I see an ad in an unexpected place, it'll make me want to buy the product?
Professor:
Well, yes and no.
這里教授的yes and no是對(duì)學(xué)生問題的回答。學(xué)生問那是不是他在任何出乎意料的地方看見廣告，他就會(huì)想要買廣告上的東西，教授說這個(gè)說法不全對(duì)。選項(xiàng)C正確。其余三個(gè)選項(xiàng)理解錯(cuò)誤。選擇C。

托福TPO38聽力Lecture3  【在線咨詢】

1. What does the professor mainly discuss?
A. The influence of avant-garde music on twentieth-century painting.
B. Critical reactions to twentieth-century experimental art forms.
C. The concepts behind a piece by an avant-garde composer.
D. The traditional elements in a famous piece of avant-garde music.
答案：C選項(xiàng)正確

解析：本題出題點(diǎn)在于：
But as the century progressed, some composers, composers of what was called avant-garde music, went further. Their experiments with musical composition were not always well accepted. Quite the contrary, you see, many people felt avant-garde music was too radical and wasn't even legitimate art.
A case in point is the composer John Cage.
這里點(diǎn)出了這篇講座的主旨，就是一群叫做avant-garde的音樂家，其中一個(gè)典型就是作曲家Cage. 結(jié)合后文，我們知道這整篇講座都在講這個(gè)Cage創(chuàng)作了一首全是無意收錄的聲音的曲子。選項(xiàng)C恰當(dāng)總結(jié)了。其余三個(gè)選項(xiàng)沒有恰當(dāng)總結(jié)。選擇C。

2. According to the professor, how was John Cage influenced by Rauschenberg's white paintings?
A. They made him understand that artists should not be concerned with their audience.
B. They showed him that an artwork with little content could still be rich in meaning.
C. They demonstrated the importance of collaborating with artists in other fields
D. They inspired him to compose music that created visual impressions in listeners.
答案：B選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Two experiences in particular entirely changed how he thought about music. First was his 1951 meeting with the avant-garde painter Robert Rauschenberg.
Now, avant-garde is a term that applies many different artistic genres. Rauschenberg had created a series of famous paintings that consisted simply of white paint of different textures on canvas. That's all they were: white.
But the concept of these paintings actually wasn't so simple.
這里提到了Cage參觀Rauschenberg的基本是空白的畫。Rauschenberg這個(gè)畫家的畫里面線條很少，基本都是白的，但是內(nèi)涵非常豐富。這啟發(fā)了Cage，他悟到其實(shí)很少的內(nèi)容也可以傳達(dá)豐富的意思。選項(xiàng)B符合意思。其余三個(gè)選項(xiàng)不符。選擇B。

3. Why was his visit to the anechoic chamber a profound experience for Cage?
A. He discovered that he could still hear sounds inside the chamber.
B. He discovered that echoes could be eliminated from a musical piece.
C. He recognized the possibility of recording his body's natural sounds.
D. He realized that music did not need to be composed in silence.
答案：A選項(xiàng)正確

解析：本題出題點(diǎn)在于：
The second key experience in Cage's development came when he stepped in an anechoic chamber. An anechoic chamber is a room with special walls that absorb sound. Anechoic means without echoes. So an anechoic chamber was a room where, in theory, you can experience total silence. But Cage entered this room and he heard two sounds, one high and one low. The high sound, he was told, was his nervous system operating, and the low sound was his blood circulating.
這里說到啟發(fā)Cage的第二個(gè)東西，就是絕對(duì)靜音的一間屋。Cage在里面聽到了自己的神經(jīng)系統(tǒng)和血液循環(huán)的聲音。選項(xiàng)A符合原文意思。其余三個(gè)選項(xiàng)不符。選擇A。

4. What was Cage's attitude toward found sound?
A. He considered found sound to be a theoretical concept with no practical use.
B. He believed any noises could be musical if arranged carefully.
C. He believed that unintentional noises could serve as replacements for musical instruments.
D. He believed that compositions with random noises could be interpreted in different ways.
答案：C選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Cage was profoundly affected. He realized that music doesn't need to be created intentionally. We find it all around us. This idea came to be called found sound. It's the sounds that are already there, traffic outside your window, or whatever. For Cage, they were just as musical as sounds made by musical instruments.
這里提到了Cage悟到的道理：他認(rèn)為音樂不一定要是有意創(chuàng)造出來的，我們身邊處處都有音樂。這種音樂被稱為非人為的音樂。比如說窗外車流的聲音。Cage認(rèn)為這種聲音和樂器演奏的聲音一樣，都是音樂。選項(xiàng)C符合意思。其余三個(gè)選項(xiàng)不符。選擇C。

5. What does the professor imply when he discusses the audience at the first performance of 4'33"?
A. He believes that outside noise might have distracted the audience.
B. He thinks that music critics appreciated the piece more than the general audience did.
C. He suspects that the audience did not want to offend the composer.
D. He thinks that the audience's response to the piece was understandable.
答案：D選項(xiàng)正確

解析：本題出題點(diǎn)在于：
Well, the audience was outraged. Music critics called the piece ridiculous. But Cage saw no reason for the outrage.
這三句的意思是，Cage的聽眾很憤怒，音樂評(píng)論家認(rèn)為這首曲子很荒謬，但是Cage本人則覺得沒必要憤怒。選項(xiàng)D符合原文意思。其余三個(gè)選項(xiàng)錯(cuò)誤理解。選擇D。

6. Why does the professor consider many of today's performance of 4'33"to be misinterpretations?
A. They take place outdoors
B. They contain sounds that are intentional.
C. The last longer than 4 minutes and 33 seconds.
D. They do not include an actual piano.
答案：D選項(xiàng)正確

解析：本題出題點(diǎn)在于：
I mean, it’s confounding people even today! Cage's silent composition is still performed all over the world, but I’m afraid to say, it's often misinterpreted. It's been choreographed, in dance performances for instance, in which case the sound was the beat of the dancers' feet against the stage floor. 教授這里提到，現(xiàn)在Cage的這種非人為作曲也是還在被音樂家應(yīng)用的，但是是錯(cuò)誤的應(yīng)用。人們開始人為地制造看似是非人為制造的音樂，比如說舞會(huì)上舞蹈家的鞋敲擊地板的聲音。所以其實(shí)現(xiàn)在的這些名義上是非人為的聲音其實(shí)是人為的。選項(xiàng)B符合意思。其余三個(gè)選項(xiàng)則錯(cuò)誤理解了。選擇B。

托福TPO38聽力Lecture4  【在線咨詢】 

1. What is the main purpose of the lecture?
A. To describe two new theories about the formation of rocky planets.
B. To discuss competing theories about the formation of gas planets.
C. To compare the composition of Jupiter, Saturn, Uranus, and Neptune.
D. To explain why young stars are often surrounded by disks of gas and dust.
答案：B選項(xiàng)正確

解析：本題的出題點(diǎn)在于：
Professor:
Last week we discussed the formation of Earth and the other rocky planets, of planets in the inner solar system. Uh, so, what about the gas giants? Jupiter, Saturn, Uranus, and Neptune.
Well, there's two theories. 這里明確說明了接下來要講關(guān)于gas giants形成的兩種理論。選項(xiàng)B符合題意。其余三個(gè)選項(xiàng)沒有很好概括。選擇B。

2. Why does the professor review the formation of rocky planets?
A. To contrast it with the formation of the Sun.
B. To correct a common misunderstanding about accretion.
C. To use the information as the basis for another topic of discussion.
D. To introduce recent discoveries about rocky planets in other solar systems.
答案：C選項(xiàng)正確

解析：本題的出題點(diǎn)在于：
Professor：
We believe our solar system began as a huge spinning cloud of dust and gas, which flattened and eventually collapsed in on itself. The matter it's centered condensed into a ball of hot gas and dust, eventually becoming our sun. And what happened to the remaining cloud?
To the disk encircling the sun when it was a young star?
Student:
The rocky planets were born.
這里是教授先帶領(lǐng)學(xué)生復(fù)習(xí)了rock planets是怎么形成的。但是這節(jié)課是要講gas giants是怎么形成的，所以前面的rock planets只是一個(gè)引子，為了引出真正的主題。選項(xiàng)C符合作者意思。其余三個(gè)選項(xiàng)不符，選擇C。

3. What point does the professor emphasize when he mentions water and ammonia?
A. Solid forms of water and ammonia may have contributed to the formation of the gas giants.
B. Water and ammonia were not common substances in the outer accretion disk.
C. Water and ammonia are pulled in by the gravity of protoplanets more readily than other substances are.
D. Most substances found in the core of rocky planets are also found in the core of gas planets.
答案：A選項(xiàng)正確

解析：本題的出題點(diǎn)在于：
Remember, the gas giants are farther from the sun, where temperatures are much colder. So, in the outer accretion disk, compounds like water and ammonia exist in frozen form. Closer to the sun, they're more likely to be vaporized by solar radiation. What this means is that in addition to rocky and metallic particles there would be other solids like frozen water and frozen ammonia.
這里出現(xiàn)了water和ammonia。教授說到這種氣態(tài)行星是離太陽很遠(yuǎn)的，所以溫度很低。水和氨氣在冰凍狀態(tài)被保存。離太陽越近，這兩者越容易氣化。這就意味著除了巖石和金屬顆粒以外，水和氨氣的固體也算是另一種的固體存在。選項(xiàng)A符合本段意思。其余三個(gè)選項(xiàng)不符。選擇A。

4. According to the professor, what could have occurred when a protoplanet in the outer accretion disk reached a mass of five to ten Earths?
A. It started to shed grains of rock and metal into the solar system.
B. Its gravity began to pull in huge amounts of the surrounding gas.
C. Its gravity caused clumps to form in the surrounding gas.
D. It collided with smaller protoplanets.
答案：B選項(xiàng)正確

解析：本題的出題點(diǎn)在于：
Professor:
And once their mass reaches a certain point, around about 5 to 10 Earths, what would happen?
Student:
5 to 10 Earths...uh, with a mass that big, I guess gravity would start to pull in more and more material faster, right?
Professor:
Material, meaning gas. It would rapidly pull in more and more gas from the accretion disk, so you end up with a solid core of rock, metal and ice surrounded by massive amounts of gas.
這里說到，當(dāng)這種氣態(tài)行星的質(zhì)量越來越大，一直大到地球的五到十倍時(shí)，重力就會(huì)把越來越多的東西吸引到星球上來，最后得到一個(gè)以巖石金屬和冰塊為核的，外周是大量氣體的星球。選項(xiàng)B符合。其余三個(gè)選項(xiàng)不符合。選擇B。

5. According to the professor, what are two claims of the disk-instability theory?
Click on 2 answers
A. Gas planet formation did not begin with a solid core.
B. Gas planets cannot form in extremely cold temperatures.
C. Gas planet formation can occur anywhere in the accretion disk.
D. Gas planets form over a relatively short time.
答案：AD選項(xiàng)正確

解析：本題的出題點(diǎn)在于：
Now, the other theory is called the disk instability theory.
The disk instability theory holds that gas begins the planet-making process, without a solid core. You see, most of the outer accretion disk would have been gas. We believe solid particles probably made up just one percent of the outer accretion disk.
Over time, dust particles within a gas clump coalesce, bond together, and eventually fall toward the center, creating a core. Once this happens, the gas clump grows relatively quickly as its gravity pulls in more and more gas and dust particles. And this whole process can theoretically happen within one hundred thousand years.
這兩段說了兩點(diǎn)關(guān)于disk instability理論的特點(diǎn)：一個(gè)是這種形成理論認(rèn)為，形成行星的時(shí)候是沒有一個(gè)固體的核的;而且這個(gè)氣體聚集的形成過程非常迅速，10萬年就能完成。這兩點(diǎn)分別對(duì)應(yīng)選項(xiàng)A和選項(xiàng)D。其余兩個(gè)選項(xiàng)則沒有依據(jù)。雙選AD。

6. Which is right about the professor's opinion about the disk-instability theory?
A. It differs from the core-accretion theory in relatively insignificant ways.
B. It does not take into account the amount of time needed for gas planets to form.
C. It is more applicable to star formation than the core-accretion theory is.
D. Solid particles are believed to own a small proportion of the outer accretion disk.
答案：D選項(xiàng)正確

解析：本題選項(xiàng)A在原文中沒有找到依據(jù)，不選;選項(xiàng)C是說star formation，恒星形成，與本文內(nèi)容也無關(guān);選項(xiàng)B涉及到Once this happens, the gas clump grows relatively quickly as its gravity pulls in more and more gas and dust particles. And this whole process can theoretically happen within one hundred thousand years，這里提到了時(shí)間，錯(cuò)誤;選項(xiàng)D的出題點(diǎn)在于：You see, most of the outer accretion disk would have been gas. We believe solid particles probably made up just one percent of the outer accretion disk. 所以outer accretion disk擁有的固態(tài)粒子很少，正確。選擇D。

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