
This post provides the complete answers and clear explanations for Cambridge IELTS 21 Academic Reading Test 3.
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Each answer includes:
> Location note: Line numbers are counted separately within each paragraph as displayed in the reading passage. When a paragraph continues onto the next page, the line count continues.
The strategy explains the best method for solving each type of IELTS Reading question.
Keywords are the most important words or phrases that help you find the relevant information in the passage.
The location identifies the reading passage, paragraph number and exact line or line range containing the answer.
The explanation shows how the question paraphrases, agrees with or contradicts the relevant information.
The answer is shown only after the location and explanation.
For note-completion questions:
The instruction says:
Choose ONE WORD ONLY from the passage for each answer.
The saiga has swollen nostrils that keep ______ out.
swollen nostrils, keep out, bulbous nose
Reading Passage 1, Paragraph 2, lines 3–4
The passage explains that the swollen nostrils of the saiga’s nose filter out dust.
Here:
The answer is a noun and follows the one-word limit.
The swollen nostrils lower the temperature of its ______ in summer.
lower temperature, summer, swollen nostrils
Reading Passage 1, Paragraph 2, lines 3–4
The passage says that the swollen nostrils cool the blood during hot and dry summers.
Here:
The saiga grows a thick ______ in winter, which it loses in spring.
thick, winter, loses, spring
Reading Passage 1, Paragraph 2, lines 5–6
The passage refers to a heavy winter coat that the saiga sheds when the weather becomes warmer.
Here:
Poaching occurs especially for the ______ of male saiga.
poaching, male saiga, traditional medicine
Reading Passage 1, Paragraph 4, lines 1–2
The passage explains that male saiga are particular targets because their horns are highly valued by traditional medicine practitioners.
Here:
The expansion of farms and settlements reduces the size of the saiga’s ______.
farms, settlements, reduction, size
Reading Passage 1, Paragraph 5, line 1
The passage says that agricultural expansion and human settlement result in a loss of habitat.
Here:
Physical barriers cause the loss of access to the ______ used for migration.
physical barriers, access, migration
Reading Passage 1, Paragraph 5, lines 2–3
The passage says that railways, pipelines and fences can block the saiga’s seasonal migration routes.
Here:
Climate change has caused the disappearance of ______ which the saiga relied on.
climate change, disappearance, relied on
Reading Passage 1, Paragraph 7, lines 4–5
The passage says the steppe region has become increasingly dry and many smaller streams have dried up and vanished.
Here:
For this type of question:
Do not answer from general knowledge. Compare the complete meaning of the statement with the passage.
Today, numbers of saiga are distributed evenly across Kazakhstan, Russia, Mongolia and Uzbekistan.
today, distributed evenly, four nations
Reading Passage 1, Paragraph 1, lines 3–5
The passage states that Kazakhstan contains well over 90% of the global saiga population. Russia, Mongolia and Uzbekistan account for the remainder.
Here:
For most of the 20th century, the population of saiga was falling.
most of the 20th century, population, falling
Reading Passage 1, Paragraph 3, lines 2–4
The passage says legal protection ensured the saiga’s survival and its numbers steadily recovered throughout most of the 20th century.
Here:
The statement contradicts the passage.
Efforts to protect rhinos in Africa had a significant effect on saiga populations.
protect rhinos, Africa, significant effect, saiga population
Reading Passage 1, Paragraph 4, lines 2–6
Conservationists encouraged people to use saiga horns as an alternative to rhino horns. This increased demand for saiga horns, causing poaching to reach epidemic levels.
Male saiga were almost wiped out, which caused a serious population crash.
Here:
Unpredictable climate fluctuations threaten Central Asian wildlife more than wildlife in other parts of the world.
climate fluctuations, Central Asian wildlife, more than other regions
Closest related location: Reading Passage 1, Paragraph 7, lines 1–3
The passage says the saiga struggles to cope with temperature extremes and unpredictable changes in climate.
However, it does not compare:
The comparison required by the statement is not provided.
The Altyn Dala Conservation Initiative was formed for the benefit of several different animals.
Altyn Dala, formed, benefit, different animals
Reading Passage 1, Paragraph 8, lines 4–6
The initiative aims to protect and restore steppe, semi-desert and desert ecosystems and the many species supported by them, including the saiga.
Here:
Recognition as a World Restoration Flagship project attracted additional international funding.
recognition, World Restoration Flagship, international funding
Closest related location: Reading Passage 1, Paragraph 8, lines 6–7
The passage says that the United Nations recognised the initiative as one of the ten best examples of large-scale ecosystem restoration.
However, it does not say:
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For these questions:
Pay particular attention to comparison words such as most, previously, majority, faster and many.
The population of Dar es Salaam is rising more rapidly than was previously predicted.
population, rising, more rapidly, previously predicted
Closest related location: Reading Passage 2, Paragraph 1, lines 1–5
The passage provides information about:
However, it does not compare the present growth rate with an earlier prediction.
The word previously introduces a comparison that is absent from the passage.
Most residents live in high-rise blocks on the edge of the city.
most residents, high-rise blocks, edge of city
Reading Passage 2, Paragraph 2, lines 1–2
The passage says four out of five residents live in single-storey informal settlements on the spreading edges of the city.
Here:
Residents have been consulted about their views on the suburban rail line.
residents, consulted, views, suburban rail line
Closest related location: Reading Passage 2, Paragraph 3, lines 2–4
The passage says that a small suburban rail line serves some residents in areas south of the city.
However, it does not mention:
Most current residential development in Dar es Salaam is unplanned.
majority, current development, unplanned
Reading Passage 2, Paragraph 4, lines 4–6
The passage says nearly all the city’s expansion is happening on its outskirts and almost all of it takes place informally without an agreed strategy.
Here:
The authorities followed a public-transport plan used by many other African cities.
authorities, followed, many African cities, transport plan
Reading Passage 2, Paragraph 5, lines 1–4
The passage says that, unlike many African cities, Dar es Salaam is not trying to build a metro. Instead, it has chosen a cheaper bus-based system.
Here:
For note-completion questions:
The instruction says:
Choose ONE WORD ONLY from the passage for each answer.
The buses use designated ______ to reduce delays.
buses, designated, reduce delays
Reading Passage 2, Paragraph 6, lines 1–2
The passage says the BRT buses travel in bus lanes separated from other traffic. These lanes are positioned to reduce stoppages.
Here:
Passengers pay their fares before ______.
passengers, pay fares, before
Reading Passage 2, Paragraph 6, lines 2–3
The passage states that ticket purchase and control take place at the stations prior to boarding.
Here:
The word also fits grammatically after before.
Passengers in ______ can use every part of the system.
passengers, every part, accessible, step-free
Reading Passage 2, Paragraph 6, lines 3–4
The passage says the buses are step-free, meaning the entire route is accessible to people using wheelchairs and those travelling with baby buggies.
The note says:
> Passengers in ______
The plural noun wheelchairs fits both the grammar and meaning.
The temperature control is sometimes not activated to reduce ______ use.
temperature control, not activated, reduce use
Reading Passage 2, Paragraph 7, lines 3–4
A passenger says drivers sometimes refuse to turn on the air conditioning because they want to save fuel.
Here:
Too few vehicles are available because of a severe ______.
insufficient vehicles, severe, main depot
Reading Passage 2, Paragraph 8, lines 1–2
The passage says there is a shortage of buses because of a serious flood at the main depot during the rainy season.
Here:
Passengers cannot use ______ because some equipment is not working.
unable to use, equipment, not working
Reading Passage 2, Paragraph 8, lines 2–4
The passage explains that smartcards cannot be used because the mechanical readers are not working.
Here:
Tickets must be checked manually at station ______.
tickets, checked manually, station
Reading Passage 2, Paragraph 8, lines 4–6
The tickets contain QR codes, but there are no scanners. Staff therefore stand beside the gates and tear the tickets as passengers enter.
Here:
______ frequently build up during rush hours.
build up, rush hours, peak times
Reading Passage 2, Paragraph 8, lines 6–7
The passage says that considerable queues form at peak times because of the manual ticket-checking system.
Here:
For multiple-choice questions:
What is the writer doing in the second paragraph?
writer doing, second paragraph, two things stand out
Reading Passage 3, Paragraph 2, lines 1–6
The writer identifies two important changes in our understanding of prehistory:
The paragraph does not mainly discuss unanswered questions, attitudes or disagreements. It identifies major revisions to our understanding.
Why does the writer mention mobile phones in the sixth paragraph?
mobile phones, sixth paragraph, evolution, technology
Reading Passage 3, Paragraph 6, lines 1–4
The writer says that evolution usually works through incremental steps, and technology develops in the same way.
Early birds were not good at flying, while early mobile phones were not very effective. These examples show that developments generally improve gradually.
What does the phrase “unpick this stuff” refer to?
unpick this stuff, patriarchal views, earlier research
Reading Passage 3, Paragraph 7, lines 1–5
The passage explains that archaeology was established by people with outdated patriarchal beliefs. These assumptions influenced how they interpreted prehistoric societies.
Researchers today are trying to separate the evidence from those old assumptions and reassess earlier conclusions.
Here:
What does the writer suggest in the final paragraph?
final paragraph, past societies, choices, inequality
Reading Passage 3, Paragraph 10, lines 1–3
The writer says inequality, authoritarianism and patriarchy are not unavoidable. They are choices, and evidence from prehistory shows that societies can be organised differently.
This suggests that studying past societies could help modern societies recognise that fairer alternatives are possible.
For matching sentence endings:
The findings at Kalambo Falls revealed that ______.
Kalambo Falls, buried logs, 476,000 years, structure
Reading Passage 3, Paragraph 3, lines 1–4
Researchers discovered logs that had been shaped with stone tools and made to interlock. The logs may have formed part of a building.
They were approximately 476,000 years old, almost 200,000 years older than Homo sapiens.
This indicates that another hominin species was capable of sophisticated construction before modern humans existed.
Evidence from high-altitude regions suggests that ______.
high-altitude regions, Denisovans, harsh environments
Reading Passage 3, Paragraph 3, lines 4–7
The passage says extinct hominins such as Denisovans lived in frozen high-altitude regions around 200,000 years ago.
This challenges the old belief that these harsh environments were first settled by modern humans only around 3,600 years ago.
An academic publication from June 2023 shows that ______.
June 2023, meta-analysis, women hunted, foraging societies
Reading Passage 3, Paragraph 8, lines 1–5
The publication analysed several dozen foraging societies and found that women hunted in 80% of them.
This contradicts the traditional idea that men hunted while women remained at home.
Here:
Analysis of a 4,000-year-old Iberian leader indicates that ______.
Iberian leader, 4,000 years, female, assumed male
Reading Passage 3, Paragraph 9, lines 1–2
Protein analysis of the leader’s teeth showed that the individual was female, although researchers had previously assumed the leader was male.
This indicates that earlier assumptions about who held positions of authority in prehistoric societies were inaccurate.
For this question type:
Focus on what the writer personally accepts, rejects or leaves uncertain.
Neanderthal cave paintings were probably the first artworks ever created.
Neanderthals, cave paintings, first artwork
Reading Passage 3, Paragraph 4, lines 1–3
The passage confirms that Neanderthals painted on cave walls. However, it says that even earlier species, such as Homo erectus, may also have made art by engraving patterns on shells.
Here:
It is very rare to find prehistoric artwork carved onto shells.
rare, prehistoric artwork, shells
Closest related location: Reading Passage 3, Paragraph 4, lines 2–3
The writer says Homo erectus may have created art by engraving patterns on shells.
However, the passage does not state:
The methods used to examine the Rising Star cave system were unconventional.
methods, examine, Rising Star cave, unconventional
Closest related location: Reading Passage 3, Paragraph 5, lines 1–4
The passage says the findings were released in a non-traditional journal that published the peer reviews publicly.
This describes an unusual publication method, not an unusual method of examining the cave.
The passage does not explain how researchers physically investigated the Rising Star cave system.
It is unclear how old the etchings in the Rising Star cave system are.
unclear, age, etchings, Rising Star
Reading Passage 3, Paragraph 4, lines 7–9 and Paragraph 5, lines 4–5
The passage says the etchings have not yet been firmly dated. The writer also says that more evidence is required, particularly regarding their date.
Here:
The way the Rising Star findings were publicised added to the controversy.
publicised, findings, controversy, released
Reading Passage 3, Paragraph 5, lines 1–4
The writer says the dispute became more intense because the findings were released in a non-traditional journal.
Here:
The size of the H. naledi brain is a key factor in deciding whether the species produced art.
brain size, key factor, H. naledi, art
Reading Passage 3, Paragraph 5, lines 5–10
The writer directly states that the species’ small brain is a distraction. Other features, including the brain’s internal wiring, may be equally or more important.
Here:
Always check whether the instructions say:
Writing extra words will make an otherwise correct answer incorrect.
For example:
IELTS questions usually express the passage information using different words.
| Question wording | Passage wording |
|---|---|
| keep out | filter out |
| lower the temperature | cool |
| loses in spring | sheds when the weather warms |
| reduction in size | loss |
| relied on | depended on |
| distributed evenly | over 90% in one country |
| unplanned | informally without an agreed strategy |
| reduce delays | reduce stoppages |
| before | prior to |
| equipment is out of action | readers are not working |
| rush hours | peak times |
| sophisticated workmanship | shaped logs forming a structure |
| harsh environments | frozen high-altitude regions |
| publicised | results were released |
| added to the controversy | dispute was heightened |
Choose FALSE when the passage gives opposite information.
Choose NOT GIVEN when the passage does not provide enough information.
The statement says most residents live in high-rise buildings.
The passage says most residents live in single-storey settlements.
The two ideas contradict each other, so the answer is FALSE.
The statement says residents were consulted about the suburban railway.
The railway is mentioned, but consultation is not discussed.
Therefore, the answer is NOT GIVEN.
Words such as the following often determine the answer:
For example, Question 8 says the saiga are distributed evenly across four countries. The passage says over 90% live in Kazakhstan.
Therefore, the answer is FALSE.
The answer must fit naturally into the incomplete sentence.
For example:
> Passengers pay fares before boarding.
The word boarding fits correctly after the preposition before.
Another example:
> Passengers in wheelchairs can use every part of the system.
The plural noun fits correctly after in.
Most IELTS Reading question groups follow the order of the passage.
For example:
After finding one answer, continue from that location instead of returning to the beginning.
A statement may include some correct information together with one unsupported detail.
For example, Question 13 correctly mentions the initiative’s international recognition. However, the claim about additional funding is not mentioned.
Therefore, the answer is NOT GIVEN.
For YES, NO, NOT GIVEN questions, identify what the writer personally accepts, rejects or leaves unclear.
In Question 40, earlier researchers focused strongly on brain size. However, the writer says brain size is a distraction.
Therefore, the answer is NO.
Before choosing an option, ask:
For Question 27, the paragraph identifies two major changes in our understanding. It does not mainly describe arguments or unanswered questions.
Therefore, A is the best answer.
After completing the test, identify why each mistake happened.
Common causes include: