PTE Listening Practice Test 6

"Ancient Rome's system of aqueducts remains one of the most impressive feats of engineering from the classical world. At its height, Rome was served by eleven separate aqueducts, some stretching over ninety kilometres, carrying water from distant springs and lakes into the city using nothing but a carefully calculated downward gradient — no pumps were involved. Roman engineers achieved remarkably precise measurements, maintaining a slope gentle enough to prevent water from rushing too fast and damaging channels, yet steep enough to keep it flowing continuously. Where the landscape required it, aqueducts were carried across valleys on tall stone arches, some of which still stand today after roughly two thousand years. Once inside the city, the water supplied public fountains, bathhouses, and the homes of wealthier residents, with usage carefully allocated through a system of legal water rights. When the Western Roman Empire declined, many aqueducts fell into disrepair or were deliberately cut during sieges, and it would take over a thousand years before European cities again achieved comparable levels of urban water supply."

রোমান জলপথ (aqueducts) দূরবর্তী উৎস থেকে পানি আনত পাম্প ছাড়াই, নির্ভুল ঢাল ব্যবহার করে। কিছু পাথরের খিলানের উপর দিয়ে যেত, আজও টিকে আছে। শহর পতনের পর অনেক জলপথ নষ্ট হয়ে যায়, শত শত বছর পর ইউরোপ আবার এমন ব্যবস্থা অর্জন করে।

"Long before refrigeration, humans developed a range of techniques to preserve food for lean seasons. Fermentation, in which naturally occurring bacteria convert sugars into acids or alcohol, not only preserves food but often improves its flavour and nutritional value, as seen in foods like yoghurt, sauerkraut and traditional pickles. Drying is another ancient method, removing the moisture that bacteria and mould require to grow; sun-dried fruits, salted fish, and cured meats all rely on this principle. Salt itself works similarly, drawing water out of food through a process called osmosis, which is why salted meats and fish can last for months without spoiling. These methods, refined over thousands of years, remain widely used today even though modern refrigeration is now available, partly because they produce distinctive flavours that freezing cannot replicate."

"One of the most fascinating aspects of child language acquisition is how effortlessly young children absorb complex grammar rules without any explicit instruction. Toddlers are rarely taught grammar directly; instead, they appear to intuitively extract patterns from the language they hear around them. A well-known example is overgeneralisation, where a child who has learned the regular past-tense rule might say 'goed' instead of 'went', mistakenly applying the pattern to an irregular verb. Rather than signalling a problem, linguists view this as strong evidence that children are actively constructing grammatical rules rather than simply imitating adults, since 'goed' is a form the child is unlikely to have ever heard spoken. Over time, through continued exposure and gentle correction, children gradually learn which verbs are exceptions to the regular pattern. This capacity to infer complex rules from limited input has led many researchers to argue that humans possess some form of innate, biologically prepared capacity for language."

"Volcanologists rely on a range of monitoring tools to anticipate potential eruptions, and one of the most important is the detection of small, often imperceptible earthquakes occurring beneath a volcano. As molten rock, or magma, moves upward through cracks in the surrounding rock, it generates these small tremors, which can be detected by sensitive seismometers placed around the volcano. An increase in the frequency of such earthquakes often, though not always, precedes an eruption, giving scientists valuable early warning time to advise evacuations. This method is typically combined with other techniques, including measuring gas emissions and using satellite radar to detect subtle ground swelling caused by rising magma, since no single method alone is considered fully reliable."

"Honey found sealed in ancient Egyptian tombs has been discovered by archaeologists to remain perfectly edible after more than three thousand years, thanks to its low moisture content and naturally acidic pH level, both of which prevent the growth of bacteria."