TOEFL Listen to an Academic Talk Practice Questions
6 original Listen to an Academic Talk recordings (24 questions) written for the current TOEFL iBT format, each with a full explanation. Free, with no account needed.
Test Ninjas Research · Updated October 1, 2026
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Notes should capture the structure — the topic, each step or example, and any contrast — rather than every word. Answer from your notes before opening the transcript.
Check each answer to see whether you are right; the explanation opens automatically and covers every option, not just the correct one. New to the task? Read the Listen to an Academic Talk guide first for the format and strategies.
Audio loads only when you press play, and each clip is labeled with its length. Every recording has a transcript you can open after you answer.
24 questions to try
1. How buried features show up in crops seen from the air
4 questions
Listen (1:13)
Show transcript
OK, last week we looked at excavation. Today I want to talk about finding sites without digging at all, from the air. After the First World War, a British archaeologist named O. G. S. Crawford noticed that photos taken from airplanes showed patterns in fields that had mostly gone unnoticed. We call many of these patterns cropmarks.
So how do they form? Say there's an old ditch buried under a wheat field. Over the centuries it's filled up with loose, organic soil, and that soil holds water. The wheat above it gets more moisture, so it grows taller and stays green longer. Now take a buried stone wall. The roots run into stone, they can't find much water, and the crop there ends up shorter and turns yellow early.
Standing in the field, you'd barely notice the difference. But from a few hundred meters up, those small differences line up into outlines: ditches, walls, whole enclosures.
The catch is the weather. In a wet summer every plant has plenty of water, and the contrast disappears. It's in a drought that the crops over buried features really show stress. That's why one dry summer can turn up sites nobody knew were there.
Now, cropmarks depend on something growing. But what about a field in January, when nothing's growing at all? That's where we'll go next.
Audio in these samples uses AI-generated voices.
Q1What is the lecture mainly about?
Show answer and explanation
Answer: B. How hidden structures reveal themselves in plants
The lecture explains cropmarks: buried features change how crops grow, and the resulting patterns show up from the air.
Evidence: “We call many of these patterns cropmarks.” / “from a few hundred meters up, those small differences line up into outlines: ditches, walls, whole enclosures.”
Why the other options are wrong
A. How early airplanes were adapted for photography — Crawford's airplane photos are mentioned only as the origin of the method; nothing is said about adapting airplanes.
C. Why wheat grows poorly on ancient farmland — Wheat grows poorly only over buried walls, and grows better over ditches; ancient farmland is not the subject.
D. Why droughts make buried ditches easier to excavate — Droughts are said to make cropmarks visible from the air; the talk is about finding sites without digging, not excavating them.
Q2According to the professor, why does wheat over a buried ditch grow taller?
Show answer and explanation
Answer: C. The fill beneath it retains extra moisture
The loose, organic ditch fill holds water, so the crop above it is better supplied with moisture.
Evidence: "Over the centuries it's filled up with loose, organic soil, and that soil holds water. The wheat above it gets more moisture, so it grows taller and stays green longer."
Why the other options are wrong
A. Its roots reach stone that anchors them — Roots running into stone describes the buried wall, where the crop is shorter.
B. It ripens earlier than the surrounding wheat — Turning yellow early is what happens over a buried wall; over a ditch the wheat stays green longer.
D. The soil above it was plowed more deeply — Plowing is never mentioned in the talk. The professor gives a different cause: the ditch has “filled up with loose, organic soil, and that soil holds water.”
Q3Why does the professor contrast standing in the field with a view from a few hundred meters up?
Show answer and explanation
Answer: C. To explain why the patterns escape notice on foot
The professor contrasts what is barely noticeable at ground level with the clear outlines seen from hundreds of meters up, which is why the patterns went unnoticed on foot.
Evidence: “Standing in the field, you'd barely notice the difference. But from a few hundred meters up, those small differences line up into outlines”
Why the other options are wrong
A. To point out that walls are easier to spot than ditches — Ditches and walls are named together as outlines seen from the air; neither is said to be easier to spot.
B. To suggest that drought makes crop differences larger — Drought is discussed in the next paragraph as a separate condition; this contrast is about viewpoint, not weather.
D. To show that low flights reveal more detail than high ones — The professor says the outlines appear from a few hundred meters up; he never compares low and high flights.
Q4What will the professor most likely discuss next?
Show answer and explanation
Answer: D. Traces detectable when fields are unplanted
The closing question points to evidence that can be seen in bare fields, where cropmarks cannot form.
Evidence: "Now, cropmarks depend on something growing. But what about a field in January, when nothing's growing at all? That's where we'll go next."
Why the other options are wrong
A. How crops recover after a long drought — Drought has already been discussed as the condition that makes cropmarks visible; recovery is not raised.
B. Where Crawford made his first survey flights — Crawford is mentioned only at the start; nothing suggests returning to his flights.
C. How ditches gradually fill with organic soil — How ditches fill has already been explained.
2. Testing seriation with dated gravestones
4 questions
Listen (1:19)
Show transcript
So how do you put objects in order when nothing has a date on it? One old answer is seriation. The idea is that styles behave a bit like fashions. A new design shows up, it's rare at first, it gets popular, and then it fades as something else replaces it. Plot how common a style is over time and you get what archaeologists call a battleship curve: narrow at both ends, wide in the middle. So with a set of undated graves, you arrange them until every style's curve comes out smooth, and that arrangement is your sequence.
But notice what you don't get. Seriation gives you an order, not calendar years, and it won't even tell you which end of the sequence is the older one. It also rests on that assumption about how styles rise and fall. So how would you check the assumption?
In the 1960s, James Deetz and Edwin Dethlefsen found a neat way: colonial gravestones in New England. They're carved with dates, and they mostly stay where they were put up. The designs went from a winged death's head, to a cherub, to an urn and willow. And when the researchers counted designs by decade, each one really did swell and shrink in that battleship shape.
There was a twist, though. The cherub caught on first around Cambridge, Massachusetts, and spread outward at roughly a mile a year. We'll come back to why that matters.
Audio in these samples uses AI-generated voices.
Q1What is the main purpose of the lecture?
Show answer and explanation
Answer: C. To explain an ordering technique and how it was checked
The talk introduces seriation, names its assumption and limits, and describes a study that tested the assumption.
Evidence: "One old answer is seriation." / "So how would you check the assumption? In the 1960s, James Deetz and Edwin Dethlefsen found a neat way"
Why the other options are wrong
A. To trace changing burial customs in New England — The gravestone designs are used as a test case for seriation, not as a history of burial customs.
B. To show how a carved design spread between towns — The cherub's spread is a final twist, a detail rather than the purpose of the talk.
D. To compare two different ways of assigning calendar dates — The professor stresses that seriation does not give calendar years at all, and only one method is described.
Q2Why does the professor mention colonial gravestones in New England?
Show answer and explanation
Answer: B. Their known dates let a key assumption be tested
Dated gravestones provided a case where the real order was known, so the battleship-curve assumption could be checked.
Evidence: "So how would you check the assumption? ... colonial gravestones in New England. They're carved with dates, and they mostly stay where they were put up."
Why the other options are wrong
A. They are the earliest objects sorted this way — The professor calls seriation an old method, but never says the gravestones were the first objects it was used on.
C. They supplied calendar years for undated graves — The gravestones were studied on their own; they were not used to date other, undated graves.
D. Their designs changed at the same rate everywhere — The cherub spread outward from Cambridge over time, so the change did not happen at the same rate everywhere.
Q3According to the professor, what is one limitation of seriation?
Show answer and explanation
Answer: D. It cannot tell the sequence's direction in time
Seriation yields an order without calendar years and without showing which end is earlier.
Evidence: "Seriation gives you an order, not calendar years, and it won't even tell you which end of the sequence is the older one."
Why the other options are wrong
A. It requires styles to spread at a fixed rate — The spreading rate is a finding about cherubs, not a requirement of the method.
B. It applies only to carved stone objects — Seriation is introduced with undated graves in general; gravestones are only the test case.
C. It groups objects by decade rather than by year — Counting by decade is how the researchers checked the curves, not a limitation of seriation; the limitation stated is that it gives no calendar years at all.
Q4What can be inferred from the professor's comments about the cherub design?
Show answer and explanation
Answer: A. Distant towns adopted one style at different times
A style that spreads at about a mile a year is popular in different places at different times, which complicates any sequence built from several locations.
Evidence: "The cherub caught on first around Cambridge, Massachusetts, and spread outward at roughly a mile a year. We'll come back to why that matters."
Why the other options are wrong
B. Rural carvers refused to adopt the design — The design did reach outlying areas; it spread outward at about a mile a year.
C. Stones near Cambridge lacked reliable carved dates — The talk says the gravestones are carved with dates; nothing suggests Cambridge stones were unreliable.
D. It replaced the urn and willow earlier outside Cambridge — The sequence was death's head, then cherub, then urn and willow, so the cherub never replaced the urn and willow.
3. What a coin under a floor can date
4 questions
Listen (1:20)
Show transcript
Let's say you're excavating a floor inside a medieval house, and right under the floor surface, sealed in, there's a coin. Coins are great for archaeologists, because you can often tell fairly closely when they were minted. So, does the coin tell you when the floor was laid?
Not exactly. What it gives you is called a terminus post quem, Latin for "the limit after which." The floor can't have been laid before that coin existed, because the coin's underneath it. So you've got the earliest possible date. But the floor might have gone down ten years later, or a hundred. Coins stayed in circulation for a long time, and they got lost whenever they got lost.
And here's the rule students forget. If a layer contains several datable objects, it's the latest one that counts. Say a layer has a coin from 1250 and a piece of pottery of a type that wasn't made until after 1300. Then the layer formed after 1300. The older coin just tells you old things were still lying around.
There's also a flip side. Suppose that floor is later cut by a pit, and the pit's sealed under a layer we can date. Now we've got a limit in the other direction, a terminus ante quem, the date before which. Put the two together and you can bracket the floor between them. That bracketing is really the heart of dating by layers, and it's what we'll practice in the lab this week.
Audio in these samples uses AI-generated voices.
Q1What is the lecture mainly about?
Show answer and explanation
Answer: A. How datable finds set boundaries on a deposit's age
The lecture is about using dated objects and the order of layers to set an earliest and a latest date for a deposit.
Evidence: "So you've got the earliest possible date." / "Put the two together and you can bracket the floor between them."
Why the other options are wrong
B. How to excavate a floor without disturbing it — Excavation technique is not discussed; the floor is only the setting for the dating problem.
C. Why pottery dates layers more reliably than coins do — The pottery example shows that the latest object counts; it doesn't claim pottery is generally better than coins.
D. How medieval coins were minted and circulated — Minting and circulation are mentioned only to explain why a coin may be old when it is lost.
Q2According to the professor, what does the coin sealed beneath the floor establish?
Show answer and explanation
Answer: C. A limit on how old the floor can be
A sealed coin gives a terminus post quem, the earliest possible date for the floor.
Evidence: "The floor can't have been laid before that coin existed, because the coin's underneath it. So you've got the earliest possible date."
Why the other options are wrong
A. How long the house remained occupied — Nothing in the talk addresses how long the house was lived in.
B. The exact year in which the floor was laid down — The professor says 'Not exactly': the floor might have gone down ten or a hundred years after the coin.
D. The latest date the floor could have been laid — A latest date comes from the terminus ante quem, the dated layer sealing the later pit.
Q3What does the professor imply when he says, "they got lost whenever they got lost"?
Show answer and explanation
Answer: D. A coin's age reveals little about its loss
The remark stresses that the moment of loss is unpredictable, so a coin's date is only an earliest limit.
Evidence: "Coins stayed in circulation for a long time, and they got lost whenever they got lost."
Why the other options are wrong
A. Lost coins are too common to be worth recording — He calls coins 'great for archaeologists'; he never suggests they aren't worth recording.
B. Coins under floors were usually placed deliberately — He treats the coins as lost, not deliberately placed.
C. Most coins were lost soon after minting — He implies the opposite: coins circulated for a long time, so loss could come long after minting.
Q4According to the professor, which of the following is NOT true of a terminus post quem?
Show answer and explanation
Answer: A. It is set by the oldest datable find in a layer.
The terminus post quem comes from the latest datable object, not the oldest; the other three statements paraphrase the second, second and fourth paragraphs.
Evidence: "So you've got the earliest possible date. But the floor might have gone down ten years later, or a hundred." / "If a layer contains several datable objects, it's the latest one that counts." / "Put the two together and you can bracket the floor between them."
Why the other options are wrong
B. It marks the earliest date a deposit could form. — True: the sealed coin gives 'the earliest possible date.'
C. It may be far older than the deposit itself. — True: the floor 'might have gone down ten years later, or a hundred.'
D. It can be paired with a limit on the latest date. — True: a dated layer sealing a later pit gives a terminus ante quem, and the two together bracket the floor.
4. Dating medieval roof timbers from their rings
4 questions
Listen (1:22)
Show transcript
If you've been inside an old timber building, a medieval barn, say, or a church roof, you might have wondered how anyone knows when it was built. Often there's no document at all. What there is, though, is the wood.
Trees in a region respond to the same weather. A dry year gives narrow rings in a lot of oaks, and a good year gives wide ones. So over a few decades you get a pattern of wide and narrow rings, a kind of barcode. Researchers have linked overlapping samples, from living trees back through old buildings, into master sequences thousands of years long. You take a core from a roof beam, slide its pattern along the master sequence until it matches, and every ring gets a calendar year.
But the last ring on the beam isn't necessarily the year the tree was cut. Carpenters squared off their beams, and that often removed the outer rings. If the bark edge survives, great, you know the exact year the tree was felled. If only part of the softer outer wood, the sapwood, is left, you estimate how many rings are missing and give a range.
One more wrinkle. Medieval carpenters mostly worked oak green, within a year or so of felling, which helps. But they also reused good timbers from older buildings. So if one beam comes out a century early, it probably doesn't overturn the others. That's why we sample several timbers, not one.
Audio in these samples uses AI-generated voices.
Q1What is the lecture mainly about?
Show answer and explanation
Answer: D. How growth patterns in wood can date a structure
The professor explains how tree-ring patterns in beams are matched to a master sequence to date buildings.
Evidence: "You take a core from a roof beam, slide its pattern along the master sequence until it matches, and every ring gets a calendar year."
Why the other options are wrong
A. How ring widths reveal past weather conditions — Weather explains why rings vary, but the aim is dating timbers, not reconstructing weather.
B. Why older timbers were often reused in barns — Reused timbers are one complication near the end, not the main subject.
C. Why medieval builders preferred oak for their roofs — Oak is the example wood, but the talk never discusses why builders chose it.
Q2Why does the professor mention the bark edge?
Show answer and explanation
Answer: A. To identify when an exact felling year is possible
The bark edge preserves the tree's final ring, so the felling year can be given exactly; otherwise only a range is possible.
Evidence: "If the bark edge survives, great, you know the exact year the tree was felled."
Why the other options are wrong
B. To show how missing sapwood rings are estimated — Estimating missing rings applies when only part of the sapwood is left, which is the contrasting case.
C. To explain why carpenters removed outer rings — Squaring off the beams is what removes the outer rings; the bark edge is mentioned as the case where they survive.
D. To explain how weather affects the width of rings — Weather and ring width are discussed earlier, in explaining the pattern itself.
Q3What would the professor probably conclude if one beam dated a century earlier than the rest of a roof?
Show answer and explanation
Answer: C. The beam was salvaged from another building
Because medieval builders reused timbers, a single much older beam is most likely taken from an older building.
Evidence: "But they also reused good timbers from older buildings. So if one beam comes out a century early, it probably doesn't overturn the others."
Why the other options are wrong
A. The beam had been left to season for years — He says medieval carpenters mostly worked oak green, within a year or so of felling, so long seasoning is unlikely.
B. The roof took about a century to finish — Nothing suggests roofs were built over such a long period; the other beams agree with one another.
D. The master sequence itself contains an error — The professor attributes an odd beam to building practice, not to a faulty master sequence.
Q4According to the professor, what do researchers do when only some sapwood remains?
Show answer and explanation
Answer: B. Report a span of possible felling years
With partial sapwood the missing outer rings are estimated and the felling date is given as a range.
Evidence: "If only part of the softer outer wood, the sapwood, is left, you estimate how many rings are missing and give a range."
Why the other options are wrong
A. Take a core from a living tree nearby — Living trees are part of building the master sequence, not the remedy for missing sapwood.
C. Count rings back from the bark edge — The bark edge is missing in this case; that is why an estimate is needed.
D. Assume the builders used unseasoned wood — Working oak green is mentioned separately, as something that helps; it doesn't replace the missing rings.
5. Recovering the erased text of a reused manuscript
4 questions
Listen (1:33)
Show transcript
So, a palimpsest. The word comes from Greek for "scraped again." Parchment, which is prepared animal skin, was expensive, so medieval scribes sometimes took an old book, scraped or washed off the ink, and wrote a new text on top. The most famous case is the Archimedes Palimpsest. Around the year 950, someone in Constantinople copied several works by Archimedes. Then in 1229 a scribe took that book apart, scraped the pages, and wrote a prayer book over them.
Scraping didn't remove everything, though. Faint traces of the old writing stayed in the parchment, and a Danish scholar, Johan Heiberg, managed to read much of it in 1906. But some pages were far worse. And in the twentieth century someone had painted forged religious pictures over a few of them, probably so the book would sell as a decorated manuscript.
After the book was sold in 1998, a team at the Walters Art Museum tried something new. They photographed each page under different wavelengths of light, ultraviolet, visible and infrared, and combined the images so the older writing stood out from the prayers. Under the paintings, even that didn't work. For those pages they used X-rays at Stanford, which picked up the iron in the original ink.
What came out included the only known copy of Archimedes' Method, where he explains how he found results before proving them. Now, why iron? To answer that, we need to look at how medieval ink was actually made.
Audio in these samples uses AI-generated voices.
Q1What is the lecture mainly about?
Show answer and explanation
Answer: B. How deliberately removed writing was brought back
The lecture traces how the erased Archimedes text beneath a later prayer book was recovered.
Evidence: "Faint traces of the old writing stayed in the parchment" / "combined the images so the older writing stood out from the prayers"
Why the other options are wrong
A. How a prayer book was decorated in 1229 — The prayer book was written in 1229; the paintings were twentieth-century forgeries, and decoration is not the topic.
C. Why medieval scribes made copies of works by Archimedes — The copying of Archimedes around 950 is background; the talk focuses on recovering that text after it was erased.
D. How parchment was prepared from animal skin — Parchment is defined in passing to explain why books were reused.
Q2According to the professor, why did medieval scribes sometimes write over old books?
Show answer and explanation
Answer: A. Their material was costly to produce
Parchment was expensive, which made reusing old books worthwhile.
Evidence: "Parchment, which is prepared animal skin, was expensive, so medieval scribes sometimes took an old book, scraped or washed off the ink, and wrote a new text on top."
Why the other options are wrong
B. Scraped pages were easier to decorate — Decoration came much later, from twentieth-century forgers, not medieval scribes.
C. Prayer books had to use older pages — The prayer book is one example of reuse, not a rule requiring old pages.
D. The old ink had already faded away — The old ink had to be scraped or washed off; it had not simply faded.
Q3Why does the professor mention the paintings added in the twentieth century?
Show answer and explanation
Answer: C. To explain a new technique for certain pages
The painted-over pages defeated the light-imaging method, which is why X-ray imaging was brought in.
Evidence: "Under the paintings, even that didn't work. For those pages they used X-rays at Stanford, which picked up the iron in the original ink."
Why the other options are wrong
A. To show that the manuscript sold for a high price — The sale is mentioned, but no price, and the forgers' motive is only a guess about making the book sell.
B. To show why Heiberg could read the pages in 1906 — The paintings made pages harder, not easier, to read, and Heiberg's work is not linked to them.
D. To explain how the prayer book was dated — The 1229 date is given without reference to the paintings.
Q4What will the professor most likely discuss next?
Show answer and explanation
Answer: C. The ingredients of medieval writing fluid
The talk ends by asking why iron was present, and the professor says the answer requires looking at medieval ink.
Evidence: "Now, why iron? To answer that, we need to look at how medieval ink was actually made."
Why the other options are wrong
A. The 1998 sale of the manuscript at auction — The sale is already past background in the story.
B. How Archimedes proved his results — The Method is mentioned as a discovery; the professor does not say he will explain the proofs.
D. How particle accelerators produce X-rays — The X-rays at Stanford are mentioned, but the professor turns to ink, not to the equipment.
6. Split tally sticks as medieval receipts
4 questions
Listen (1:23)
Show transcript
When you pay a bill today, you get a receipt. In medieval England, if a sheriff brought money to the king's treasury, the Exchequer, the receipt was a stick. A tally stick.
An official took a squared length of hazel wood and cut notches across it. The size of a notch showed the amount. A cut as wide as the palm of your hand meant a thousand pounds, the width of a thumb meant a hundred, and smaller cuts stood for pounds, shillings and pennies. Then, and this is the clever part, the stick was split lengthwise, right through the notches, and each party kept one half.
Why split it? Because wood never splits perfectly straight. The grain leaves an irregular edge that's unique to that stick. So if there was a dispute about the amount, you'd put the two halves back together. If the notches and the grain lined up, the record was genuine. Add a notch to your half, and it'd show the moment the pieces were matched.
The system lasted an astonishingly long time, from around 1100 to 1826. And it ended famously. In 1834, officials burned the old sticks in a furnace under the House of Lords, and the fire destroyed most of the old Palace of Westminster.
OK. A tally recorded one payment. But the Exchequer also had to total a whole year's accounts, and for that it used a big checkered cloth. That's what I want to show you next.
Audio in these samples uses AI-generated voices.
Q1What is the main purpose of the lecture?
Show answer and explanation
Answer: B. To explain how a medieval record guarded against fraud
The lecture explains how the split tally worked as a tamper-evident record of payment.
Evidence: "Why split it? ... If the notches and the grain lined up, the record was genuine. Add a notch to your half, and it'd show the moment the pieces were matched."
Why the other options are wrong
A. To describe the causes of a destructive 1834 fire — The fire is the famous end of the system, not the focus of the talk.
C. To trace how the Exchequer totaled a year's accounts — Totaling a year's accounts is what the professor will turn to next.
D. To compare wooden receipts with written ones — Modern receipts appear only in the opening comparison; written medieval receipts are never discussed.
Q2Why does the professor mention that wood never splits perfectly straight?
Show answer and explanation
Answer: A. To explain why tampering would be exposed
The uneven split makes each pair of halves unique, so an altered half would not match.
Evidence: "Because wood never splits perfectly straight. The grain leaves an irregular edge that's unique to that stick."
Why the other options are wrong
B. To explain why hazel was chosen for tallies — Hazel is named, but no reason for choosing it is given.
C. To account for the fire in the furnace — The fire came from burning the sticks, not from the way they split.
D. To show why notches differed in width — Notch width shows the amount; it is unrelated to how the wood splits.
Q3What is the professor's attitude toward the tally stick system?
Show answer and explanation
Answer: A. He is impressed by its ingenuity
His word choices, 'the clever part' and 'astonishingly long time,' show admiration for the design.
Evidence: "Then, and this is the clever part, the stick was split lengthwise" / "The system lasted an astonishingly long time"
Why the other options are wrong
B. He regards it as a primitive stopgap — He stresses how long it lasted, from around 1100 to 1826, which is not how he would describe a stopgap.
C. He considers it too easy to forge — He explains that an added notch would show when the halves were matched, so it resisted forgery.
D. He blames it for the loss of many records — He tells the story of the 1834 fire, but he doesn't criticize the system for it.
Q4What will the professor most likely discuss next?
Show answer and explanation
Answer: D. A counting aid for yearly accounts
The professor ends by introducing the checkered cloth used to total the year's accounts.
Evidence: "But the Exchequer also had to total a whole year's accounts, and for that it used a big checkered cloth. That's what I want to show you next."
Why the other options are wrong
A. Other uses of hazel wood in medieval England — Hazel is named only as the material of tallies.
B. How sheriffs collected money in their counties — Sheriffs appear only as people bringing money to the treasury.
C. The rebuilding of the Palace of Westminster — The palace fire is mentioned as the end of the tally story; rebuilding is not raised.