Reading Lab

IELTS Academic Reading Practice Pack 11

A premium Academic Reading set on sleep neuroscience, urban heat adaptation, and the social origins of money.

Question count

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60 min

Passages

academicreadingfull mocksleepurban climateeconomic historytfngynngqa candidate

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Passage 1

The Architecture Of Sleep: Why Rest Is Not Passive

Why sleep is an active biological process, how distinct sleep stages matter, and why modern life systematically damages recovery.

A.For much of human history, sleep was considered a passive state — a simple suspension of activity during which the brain and body idled until morning. This view has been overturned decisively by modern neuroscience. Sleep is now understood to be an intensely active biological process, comprising distinct stages that serve separate and irreplaceable physiological functions. Understanding its architecture helps explain why disrupting even a single stage can have consequences far beyond tiredness.

B.A typical night of sleep for a healthy adult is organised into cycles of approximately ninety minutes, each containing both non-rapid eye movement (NREM) sleep and a period of rapid eye movement (REM) sleep. NREM sleep is itself divided into three stages of increasing depth. Stage one is a transitional phase lasting only a few minutes, during which the sleeper can be woken easily. Stage two, which accounts for roughly half of total sleep time in adults, is characterised by sleep spindles — brief bursts of neural activity that appear to play a central role in consolidating newly acquired information into long-term memory. Stage three, commonly called slow-wave sleep or deep sleep, is the stage most associated with physical restoration: it is during this phase that the pituitary gland releases growth hormone, tissue repair occurs, and the immune system is reinforced.

C.REM sleep, which intensifies and lengthens in successive cycles across the night, is when the most vivid dreaming occurs. The brain during REM sleep is almost as electrically active as during full wakefulness, yet the body is essentially paralysed through active suppression of motor neurons — a mechanism that prevents sleepers from physically acting out their dreams. REM sleep appears to be particularly important for emotional memory processing and creative problem-solving. Research by Matthew Walker of the University of California, Berkeley has demonstrated that REM sleep allows the brain to forge novel connections between distantly related concepts, a process he describes as a form of overnight therapy.

D.The question of how much sleep humans actually require has attracted considerable scientific debate. The widely cited recommendation of eight hours is an average rather than a universal prescription. Genetic variation plays a significant role: a small proportion of the population carries mutations in genes such as DEC2 that allow them to function optimally on six hours or fewer without the cognitive or health deficits that would afflict most people on the same amount. At the other extreme, some individuals consistently require nine or ten hours. Age is also a crucial variable. Newborns spend up to seventeen hours asleep, much of it in REM sleep, which is thought to support rapid neural development. The proportion of deep sleep declines sharply with age, and adults over sixty typically obtain far less slow-wave sleep than younger adults even when total sleep time remains similar.

E.The consequences of chronic sleep deprivation are both well-documented and alarming. A landmark study by David Dinges and colleagues at the University of Pennsylvania found that restricting sleep to six hours a night for two weeks produced cognitive impairments equivalent to two full nights of total sleep deprivation — yet the participants consistently underestimated their own degree of impairment. This disconnect between perceived and actual performance has serious implications for industries where sustained attention is critical, including medicine, aviation, and transport.

F.Beyond cognition, chronic short sleep is associated with elevated risks of cardiovascular disease, type 2 diabetes, obesity, and certain cancers. The mechanism linking sleep loss to metabolic disruption is increasingly well understood: insufficient sleep elevates cortisol, disrupts insulin sensitivity, and alters the balance of the appetite-regulating hormones leptin and ghrelin in ways that promote overeating. The immunological consequences are equally pronounced. A study published in the journal Sleep found that individuals sleeping fewer than six hours a night were four times more likely to develop a cold when exposed to a rhinovirus than those sleeping seven or more hours.

G.Modern societies have created structural conditions that systematically undermine adequate sleep. Artificial light, particularly the blue-wavelength light emitted by screens, suppresses melatonin secretion and delays sleep onset. Shift work disrupts the circadian rhythm — the internal biological clock regulated by the suprachiasmatic nucleus of the hypothalamus — with consequences that extend beyond fatigue to include measurable increases in the risk of certain cancers and metabolic disorders. The social normalisation of short sleep, sometimes framed as evidence of productivity or dedication, may therefore represent one of the more consequential public health failures of the contemporary era.

Matching Headings

Questions 1-6

Passage 1 has seven paragraphs labelled A-G.

Paragraph B has been matched as an example.

Choose the correct heading for paragraphs A, C-G from the list below.

Write the correct number (i-x) in boxes 1-6 on your answer sheet.

NB There are more headings than paragraphs, so you will not use all of them.

1. Paragraph A

i Individual variation in sleep requirements across the lifespan
ii The role of a specific sleep stage in creative thinking and emotional regulation
iii Why poor sleep is linked to weight gain and increased susceptibility to illness
iv A historical misconception corrected by contemporary research
v The functions performed by each phase of the night's structure
vi How modern environments and cultural attitudes undermine healthy sleep
vii The measurable cognitive effects of sustained sleep restriction
viii The stages of light sleep and their contribution to learning
ix Why the body becomes immobilised during dreaming
x The link between sleep loss and workplace accidents

2. Paragraph C

i Individual variation in sleep requirements across the lifespan
ii The role of a specific sleep stage in creative thinking and emotional regulation
iii Why poor sleep is linked to weight gain and increased susceptibility to illness
iv A historical misconception corrected by contemporary research
v The functions performed by each phase of the night's structure
vi How modern environments and cultural attitudes undermine healthy sleep
vii The measurable cognitive effects of sustained sleep restriction
viii The stages of light sleep and their contribution to learning
ix Why the body becomes immobilised during dreaming
x The link between sleep loss and workplace accidents

3. Paragraph D

i Individual variation in sleep requirements across the lifespan
ii The role of a specific sleep stage in creative thinking and emotional regulation
iii Why poor sleep is linked to weight gain and increased susceptibility to illness
iv A historical misconception corrected by contemporary research
v The functions performed by each phase of the night's structure
vi How modern environments and cultural attitudes undermine healthy sleep
vii The measurable cognitive effects of sustained sleep restriction
viii The stages of light sleep and their contribution to learning
ix Why the body becomes immobilised during dreaming
x The link between sleep loss and workplace accidents

4. Paragraph E

i Individual variation in sleep requirements across the lifespan
ii The role of a specific sleep stage in creative thinking and emotional regulation
iii Why poor sleep is linked to weight gain and increased susceptibility to illness
iv A historical misconception corrected by contemporary research
v The functions performed by each phase of the night's structure
vi How modern environments and cultural attitudes undermine healthy sleep
vii The measurable cognitive effects of sustained sleep restriction
viii The stages of light sleep and their contribution to learning
ix Why the body becomes immobilised during dreaming
x The link between sleep loss and workplace accidents

5. Paragraph F

i Individual variation in sleep requirements across the lifespan
ii The role of a specific sleep stage in creative thinking and emotional regulation
iii Why poor sleep is linked to weight gain and increased susceptibility to illness
iv A historical misconception corrected by contemporary research
v The functions performed by each phase of the night's structure
vi How modern environments and cultural attitudes undermine healthy sleep
vii The measurable cognitive effects of sustained sleep restriction
viii The stages of light sleep and their contribution to learning
ix Why the body becomes immobilised during dreaming
x The link between sleep loss and workplace accidents

6. Paragraph G

i Individual variation in sleep requirements across the lifespan
ii The role of a specific sleep stage in creative thinking and emotional regulation
iii Why poor sleep is linked to weight gain and increased susceptibility to illness
iv A historical misconception corrected by contemporary research
v The functions performed by each phase of the night's structure
vi How modern environments and cultural attitudes undermine healthy sleep
vii The measurable cognitive effects of sustained sleep restriction
viii The stages of light sleep and their contribution to learning
ix Why the body becomes immobilised during dreaming
x The link between sleep loss and workplace accidents

Note Completion

Questions 7-13

Complete the notes below.

Choose NO MORE THAN TWO WORDS from Passage 1 for each answer.

Write your answers in boxes 7-13 on your answer sheet.

Sleep Stage Notes

Stage 2 (NREM)

Characterised by:

7. Stage 2 (NREM) characteristic: ______

8. Stage 2 (NREM) function: consolidation into ______

9. Stage 3 / deep sleep is also called ______

10. Growth hormone is released by the ______

11. Stage 3 is most associated with physical ______

12. During REM sleep, motor neurons are ______

13. Walker describes REM sleep's special cognitive role as ______

Passage 2

The Urban Heat Island: Causes, Consequences, And Contested Remedies

Why cities trap heat, why vulnerability is unevenly distributed, and why common cooling remedies do not work equally well.

A.Cities are warmer than the surrounding countryside. This phenomenon, first documented systematically by the meteorologist Luke Howard in his 1818 study of London's climate, is now one of the most thoroughly characterised features of urban environments worldwide. The urban heat island (UHI) effect describes the tendency of built-up areas to retain and generate heat at levels significantly above those of adjacent rural land, with temperature differentials that typically range from two to five degrees Celsius and can reach ten degrees or more in large metropolitan areas during calm, clear nights.

B.The physical mechanisms underlying the UHI are multiple and interconnected. Dark surfaces — asphalt roads, flat rooftops, and dark-coloured building cladding — absorb a far greater proportion of incoming solar radiation than the vegetation and soil they have replaced. The energy absorbed during the day is re-emitted as longwave radiation at night, keeping urban air temperatures elevated long after sunset. The geometry of city streets compounds this effect: tall buildings on either side of a narrow street create what urban climatologists call a street canyon, in which radiation bounces repeatedly between surfaces rather than escaping skyward. Meanwhile, the near-elimination of vegetated surfaces drastically reduces evapotranspiration — the process by which plants release water vapour, which cools the surrounding air through latent heat loss. A single mature tree can transpire hundreds of litres of water per day, providing a cooling effect comparable to several air-conditioning units.

C.Human activity contributes directly to the UHI through waste heat: the thermal energy discharged by vehicles, industrial processes, air-conditioning systems, and human bodies themselves. In dense urban cores, this anthropogenic heat flux can be substantial, in some cases exceeding the heat input from solar radiation on overcast days. Air-conditioning presents a particularly vexing feedback loop: as cities become hotter, demand for cooling increases, which discharges more waste heat into the urban atmosphere, which raises temperatures further, creating additional demand.

D.The consequences of the UHI are not uniformly distributed across urban populations. Elderly residents, infants, outdoor workers, and those living in poorly insulated housing without access to cooling are disproportionately vulnerable to heat stress. The European heatwave of 2003, which caused approximately seventy thousand excess deaths, illustrated how quickly extreme heat can overwhelm public health systems in cities unprepared for sustained high temperatures. Urban planners and public health researchers have noted that socioeconomic factors systematically concentrate the most vulnerable populations in areas with the least green space and the highest surface temperatures, creating what researchers term a compounded vulnerability.

E.Proposed remedies broadly divide into two categories: reducing heat absorption and increasing heat dissipation. Cool roofs — surfaces coated with highly reflective materials — can reduce roof surface temperatures by twenty-five degrees Celsius or more relative to conventional dark roofing, and modelling studies suggest widespread adoption could reduce urban air temperatures by up to two degrees. Green roofs, which support growing plants, combine reflectivity benefits with evapotranspiration, though they require structural support and maintenance that many buildings cannot accommodate. Street trees and urban parks provide localised cooling through shade and transpiration, and several cities including Singapore and Melbourne have adopted ambitious urban greening targets as part of formal heat mitigation strategies.

F.The case for cool pavements — roads and footpaths treated with reflective coatings or constructed from lighter-coloured materials — is more contested. While reduced surface absorption is theoretically beneficial, reflective pavements redirect solar radiation upward, potentially increasing radiant heat experienced by pedestrians at ground level even when air temperatures decline. Field studies in Los Angeles found mixed results, with some residents reporting greater thermal discomfort in areas where cool pavement pilots had been implemented, despite lower measured air temperatures. The divergence between thermal comfort and air temperature illustrates a broader challenge in UHI research: the metrics used to evaluate interventions do not always align with the subjective experience of the people those interventions are intended to benefit.

G.District cooling systems — centralised plants that produce chilled water distributed through underground pipe networks to cool buildings — offer another approach. They are significantly more energy-efficient than building-by-building air-conditioning and can be powered by renewable energy, avoiding the fossil-fuel feedback loop of conventional cooling. However, the high capital cost of infrastructure and the difficulties of retrofitting existing urban fabrics have limited deployment largely to planned developments in the Gulf states, parts of East Asia, and a small number of European city centres. Whether such systems can be scaled and financed in the contexts where they are most needed — rapidly urbanising cities in South Asia and sub-Saharan Africa — remains an open question.

Yes/No/Not Given

Questions 14-19

Do the following statements agree with the claims of the writer in Passage 2?

In boxes 14-19 on your answer sheet, write:

YES if the statement agrees with the claims of the writer

NO if the statement contradicts the claims of the writer

NOT GIVEN if it is impossible to say what the writer thinks about this

14. Luke Howard was the first scientist to measure urban temperatures systematically.

15. The street canyon effect causes buildings to absorb more solar radiation during the day.

16. Elderly people and infants are more at risk from urban heat than other groups because they have weaker immune systems.

17. Cool pavements have been shown to make pedestrians feel more comfortable even when they lower air temperatures.

18. District cooling systems use more energy than individual building air-conditioning units.

19. The writer believes the spread of district cooling in developing cities depends on factors beyond technology.

Matching Features

Questions 20-26

Look at the following descriptions (Questions 20-26).

Match each description with the correct UHI intervention or feature, A-G.

Write the correct letter in boxes 20-26 on your answer sheet.

NB You may use any letter more than once.

20. This process is responsible for a significant portion of the cooling effect provided by vegetation.

A Cool roofs
B Green roofs
C Street trees and urban parks
D Cool pavements
E District cooling systems
F Air-conditioning (conventional)
G Evapotranspiration

21. This intervention may reduce surface temperatures significantly but can increase discomfort at ground level.

A Cool roofs
B Green roofs
C Street trees and urban parks
D Cool pavements
E District cooling systems
F Air-conditioning (conventional)
G Evapotranspiration

22. This approach requires buildings to have sufficient structural capacity and ongoing maintenance.

A Cool roofs
B Green roofs
C Street trees and urban parks
D Cool pavements
E District cooling systems
F Air-conditioning (conventional)
G Evapotranspiration

23. This intervention creates a self-reinforcing cycle that worsens the problem it is intended to solve.

A Cool roofs
B Green roofs
C Street trees and urban parks
D Cool pavements
E District cooling systems
F Air-conditioning (conventional)
G Evapotranspiration

24. This intervention could provide cooling of up to two degrees across an entire city if widely adopted.

A Cool roofs
B Green roofs
C Street trees and urban parks
D Cool pavements
E District cooling systems
F Air-conditioning (conventional)
G Evapotranspiration

25. This system is well established in Gulf states and parts of East Asia but rare elsewhere.

A Cool roofs
B Green roofs
C Street trees and urban parks
D Cool pavements
E District cooling systems
F Air-conditioning (conventional)
G Evapotranspiration

26. This approach combines two separate mechanisms to provide cooling.

A Cool roofs
B Green roofs
C Street trees and urban parks
D Cool pavements
E District cooling systems
F Air-conditioning (conventional)
G Evapotranspiration

Passage 3

The Myth Of Barter And The Social Origins Of Money

Why the standard barter story is historically weak and why money emerged through obligation, accounting, and state power.

A.The conventional account of money's origins, reproduced in economics textbooks from Adam Smith to the present day, runs as follows: before money, people bartered — exchanging goods and services directly with one another. Barter, however, was inconvenient because it required a coincidence of wants: a farmer who had surplus grain and needed boots could only complete an exchange if she found a cobbler who wanted grain and had spare boots at that precise moment. Money, in this account, emerged as a natural solution to the inefficiency of barter, a medium of exchange that decoupled the two sides of a transaction and allowed markets to function smoothly.

B.This narrative is historically false. Anthropologists and economic historians have searched extensively for evidence of barter-based economies among pre-monetary societies and have found almost none. The most thorough demolition of the barter myth was assembled by the anthropologist David Graeber in his 2011 work Debt: The First 5,000 Years. Drawing on ethnographic records from hundreds of societies across multiple continents, Graeber found that where money was absent, people did not typically engage in spot-exchange barter with strangers. Instead, they operated through systems of credit, mutual obligation, and gift exchange embedded in social relationships. A hunter who provided meat to a neighbour was not completing a transaction; he was creating a social bond that would generate reciprocal obligations over time.

C.The archaeological and cuneiform record tells a more precise story about money's actual emergence. The earliest known monetary systems appear in ancient Mesopotamia around 3000 BCE, and they are conspicuously not markets in the modern sense. Temples and palaces maintained elaborate systems of account in which grain, silver, and later standardised tokens recorded debts and obligations. Workers received rations; taxes and tribute were tracked; loans were made and forgiven. Silver by weight served as a unit of account long before it circulated as coinage, and the prices recorded in Mesopotamian tablets are remarkably stable over centuries — a pattern inconsistent with freely fluctuating market exchange but consistent with administrative price-setting. The economist Michael Hudson has argued that what we identify as ancient markets were largely downstream of these state and temple accounting systems rather than independent phenomena that preceded them.

D.The invention of coinage — distinct from earlier uses of metal by weight — appears to have occurred independently in three regions during the seventh and sixth centuries BCE: in Lydia (present-day western Turkey), in northern India, and in China. Significantly, all three cases are associated not with commerce between merchants but with military logistics. Governments needed to provision large armies of soldiers who were strangers to one another and to the populations they moved through. Coinage solved the problem of paying soldiers in a form they could use to acquire food, shelter, and other necessities from local populations without requiring the social relationships that underpinned credit systems. The historian David Graeber and the classicist Richard Seaford have separately argued that war, slavery, and taxation — not peaceful trade — were the generative conditions for coined money.

E.If money did not arise from barter, this has significant implications for how economists and policymakers think about its nature. The dominant view, enshrined in most undergraduate curricula, treats money as a commodity that acquired its value through market processes — a neutral veil draped over real economic activity. Alternative traditions, associated with economists such as Knapp, Lerner, and Innes, argue instead that money is fundamentally a creature of law and social convention: its value derives not from any intrinsic property but from the authority of the issuing institution and, above all, from the requirement that taxes and debts be settled in it. This view, known as chartalism or modern monetary theory in its contemporary form, leads to quite different conclusions about fiscal policy, government debt, and the appropriate role of the state in monetary systems.

F.The debate has practical stakes. If money is essentially a social technology for tracking obligations rather than a commodity, then the persistent analogy between household finances and government budgets — a trope deployed in political discourse across the ideological spectrum — is fundamentally misleading. A household that runs out of money cannot create more; a government that issues its own currency operates under entirely different constraints. The confusion between these two logics has shaped austerity debates in Europe, debt-ceiling confrontations in the United States, and development finance policy across the Global South in ways that critics argue have caused substantial and avoidable harm.

G.Contemporary digital currencies introduce a new dimension to these questions. Bitcoin and its successors were explicitly designed to replicate the properties of commodity money — with a fixed supply and no issuing authority — as a response to distrust of state-backed monetary systems. Whether they represent a genuine monetary innovation or a sophisticated re-enactment of discredited commodity theory dressed in cryptographic clothing is a question whose answer will depend, as it always has, less on the technology involved than on the social and political structures within which any money ultimately operates.

True/False/Not Given

Questions 27-33

Do the following statements agree with the information given in Passage 3?

In boxes 27-33 on your answer sheet, write:

TRUE if the statement agrees with the information

FALSE if the statement contradicts the information

NOT GIVEN if there is no information on this in the passage

27. Adam Smith proposed that money emerged as a practical solution to the problems of barter.

28. David Graeber's research found that pre-monetary societies typically used barter when money was unavailable.

29. In ancient Mesopotamia, silver served as a unit of account before it was used as physical currency.

30. Coinage was first invented in Lydia and later spread independently to India and China.

31. All three early coinage systems are thought to have developed primarily to facilitate trade between merchants.

32. The chartalist view of money leads to different conclusions about government borrowing than the commodity view does.

33. The writer is confident that Bitcoin represents a fundamentally new development in the history of money.

Sentence Completion

Questions 34-37

Complete the sentences below.

Choose NO MORE THAN TWO WORDS from Passage 3 for each answer.

Write your answers in boxes 34-37 on your answer sheet.

34. Before Graeber's work, historians expected to find evidence of ______ exchange in pre-monetary societies.

35. In Mesopotamia, the stability of recorded prices over long periods suggests that exchange was controlled by ______ rather than market forces.

36. The historian David Graeber argued that the primary conditions that produced coinage were war, ______, and taxation.

37. Critics argue that the analogy between ______ finances and government budgets is fundamentally misleading.

Short-answer Questions

Questions 38-40

Answer the questions below.

Choose NO MORE THAN THREE WORDS from Passage 3 for each answer.

Write your answers in boxes 38-40 on your answer sheet.

38. What does David Graeber identify as the type of relationship that governed exchange in pre-monetary societies, rather than direct transaction?

39. What name is given to the contemporary form of the chartalist view of money?

40. According to the writer, what will ultimately determine whether digital currencies succeed as money?