Passage 1: The Domestication of the Horse: What the Bones and Genes Now Say
AFew animals have altered the course of human history as profoundly as the horse. Once tamed, it multiplied the speed at which people, goods and armies could move, and it remade trade, warfare and agriculture across three continents. Historians have long ranked the change alongside the invention of the wheel and the adoption of iron tools as one of the handful of technological shifts capable of reorganising an entire society within a few generations, and the horse's case is unusual only in how long it took specialists to agree on where and when that shift actually began. Yet for more than a century, archaeologists and geneticists have disputed the most basic facts of the story: where the first domestic horses appeared, and when. Only in the last decade has a coherent answer begun to emerge, and it has overturned much of what was once taught as settled fact. The stakes of getting the story right are not merely academic: the horse's arrival reorganised societies as far apart as the steppes of Central Asia and the river valleys of the Near East, and pinpointing its origin has become one of the most closely watched questions in archaeological science.
BFor years, the leading candidate was the Botai culture, a community of hunter-herders who lived in what is now northern Kazakhstan around 3500 BCE. Excavations at Botai settlements uncovered horse teeth bearing distinctive wear patterns consistent with the use of a bit, along with postholes interpreted as the remains of corrals. Chemical analysis of pottery fragments went further: lipid residues extracted from cooking vessels contained fatty compounds matching mare's milk, implying that the Botai were not only riding horses but milking them. On this evidence, many researchers concluded that Botai marked the site and moment of domestication.
CThat conclusion did not survive contact with ancient DNA. When geneticists sequenced genomes recovered from Botai horse bones, the animals turned out to belong to a distinct lineage.. one that is now recognised as ancestral not to the modern domestic horse but to the Przewalski's horse, the small, stocky wild subspecies that still roams the steppes of Mongolia. Whatever the Botai were doing with horses, it did not give rise to the population that today's domestic breeds descend from. The search for the true origin point had to start again.
DIt was resolved, provisionally, by a large-scale genomic survey published in 2021. An international team led by the palaeogeneticist Ludovic Orlando sequenced and compared more than 200 ancient horse genomes recovered from sites scattered across Eurasia, from Portugal to Mongolia. The genetic signal converged on a single homeland: the steppe of the lower Volga-Don region, north of the Caucasus, around 2200 BCE. Horses bearing this genetic signature are barely detectable in the region before that date and dominate the record almost everywhere else within a few centuries afterward.. a pattern the authors read as the signature of a genuine domestication event followed by an extraordinarily rapid expansion. The team cross-checked the genomic data against radiocarbon dates from the same skeletal remains, a step that allowed them to rule out several previously proposed origin regions, including Anatolia and the Iberian peninsula, both of which had featured in earlier hypotheses.
EWhat made the Volga-Don horses so successful was not size or speed alone. Comparing their genomes with those of earlier, undomesticated populations, the researchers identified two genes associated with docility and a third linked to a stronger back.. changes plausibly connected to selective breeding for animals that could be ridden and controlled. Within a few hundred years, this lineage had displaced almost every other horse population across Europe and Asia; only in peripheral regions such as Iberia and Anatolia did older, locally distinct populations persist for longer.
FThe timing of this expansion is difficult to separate from another development on the steppe: the spread of spoke-wheeled chariots. At Sintashta, a fortified settlement complex in the southern Ural steppe dated to around 2000 BCE, archaeologists have recovered burial graves containing complete chariots, their wheels fitted with spokes rather than the solid wooden discs used earlier. Some scholars now argue that the horse's genetic transformation and the chariot's mechanical one were parts of a single technological package, one that spread with unusual speed because it conferred a decisive military and economic advantage on whoever possessed it. Whether or not the two innovations were coordinated, their near-simultaneous appearance on the same stretch of steppe is, at minimum, a striking coincidence that continues to draw archaeologists back to the region.
- posthole:
- a hole dug into the ground to hold an upright wooden post; archaeologists use surviving postholes to reconstruct the outline of structures, such as fences or corrals, whose wood has long since decayed.
- lipid residue:
- microscopic traces of fat or oil molecules that survive for thousands of years inside porous pottery and can be identified through chemical analysis.
- palaeogeneticist:
- a scientist who extracts and studies DNA recovered from ancient bones or other remains.
أسئلة النص 1
Do the following statements agree with the information given in Reading Passage 1? 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.
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1The settlements at Botai are located in the southern part of Kazakhstan.
TRUE / FALSE / NOT GIVEN
اعرض الإجابة
FALSE
""a community of hunter-herders who lived in what is now northern Kazakhstan" (Paragraph B)"
ليش صحيح: النص يقول صراحة "شمال" كازاخستان، والعبارة تدّعي "جنوب"، وهو تناقض في عنصر واحد محدد (الاتجاه).
ليش الباقي خطأ: ليست NOT GIVEN لأن الموقع مذكور صراحة؛ وليست TRUE لأن الاتجاه المذكور هو عكس ما جاء بالعبارة.
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2Bit-wear marks on horse teeth were the only evidence that the Botai kept horses.
TRUE / FALSE / NOT GIVEN
اعرض الإجابة
FALSE
""Excavations at Botai settlements uncovered horse teeth bearing distinctive wear patterns consistent with the use of a bit, along with postholes interpreted as the remains of corrals. Chemical analysis of pottery fragments went further: lipid residues extracted from cooking vessels contained fatty compounds matching mare's milk" (Paragraph B)"
ليش صحيح: النص يذكر أدلة أخرى غير تآكل الأسنان الناتج عن اللجام.. الحظائر (postholes) وبقايا الحليب الدهنية (lipid residues).. مما يناقض مباشرة كلمة "only" في العبارة.
ليش الباقي خطأ: ليست NOT GIVEN لأن أدلة إضافية مذكورة صراحة في نفس الفقرة؛ وليست TRUE لأن كلمة "only" تتعارض مع وجود أدلة أخرى مذكورة.
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3The corrals identified at Botai settlements were large enough to hold several hundred horses at once.
TRUE / FALSE / NOT GIVEN
اعرض الإجابة
NOT GIVEN
""postholes interpreted as the remains of corrals" (Paragraph B).. لا ذكر لأي رقم أو سعة."
ليش صحيح: الحظائر مذكورة كموضوع لكن سعتها الرقمية غير مذكورة إثباتًا أو نفيًا.. adjacent anchor كلاسيكي.
ليش الباقي خطأ: ليست TRUE لعدم ذكر الرقم؛ وليست FALSE لعدم وجود ما يناقض هذا الرقم تحديدًا.
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4DNA testing confirmed that the Botai horses are the ancestors of today's domestic horse breeds.
TRUE / FALSE / NOT GIVEN
اعرض الإجابة
FALSE
""ancestral not to the modern domestic horse but to the Przewalski's horse" (Paragraph C)"
ليش صحيح: النص ينفي هذا الادعاء صراحة ويذكر أن الأسلاف هم حصان Przewalski البري، لا السلالة المستأنسة الحديثة.
ليش الباقي خطأ: ليست NOT GIVEN لوجود نفي صريح؛ وليست TRUE لأن العبارة تدّعي عكس المؤكد في النص.
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5The genetic material used in the 2021 study was drawn exclusively from museum specimens.
TRUE / FALSE / NOT GIVEN
اعرض الإجابة
NOT GIVEN
""more than 200 ancient horse genomes recovered from sites scattered across Eurasia" (Paragraph D).. لا ذكر لكونها من متاحف حصرًا."
ليش صحيح: مصدر العينات (مواقع أثرية) مذكور لكن دون تحديد "متاحف حصرًا".. لا إثبات ولا نفي.
ليش الباقي خطأ: ليست TRUE لعدم ذكر ذلك؛ وليست FALSE لعدم وجود تصريح يناقضه تحديدًا.
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6Iberia and Anatolia were among the few regions where older, locally distinct horse populations survived longer than elsewhere.
TRUE / FALSE / NOT GIVEN
اعرض الإجابة
TRUE
""only in peripheral regions such as Iberia and Anatolia did older, locally distinct populations persist for longer" (Paragraph E)"
ليش صحيح: إعادة صياغة مباشرة لنفس الاستثناء المذكور بالاسم في النص.
ليش الباقي خطأ: ليست FALSE لعدم وجود تناقض؛ وليست NOT GIVEN لأن الاستثناء مذكور صراحة.
Complete the table below. Choose NO MORE THAN TWO WORDS from the passage for each answer.
Key sites in the archaeology of horse domestication
| Approximate date associated with the Botai culture | (7) ________ |
|---|---|
| Substance identified in residues on Botai pottery | (8) ________ |
| What genetic testing showed the Botai horses were ancestral to | (9) ________ |
| Approximate date now assigned to the domestication of the Volga-Don population | (10) ________ |
| Approximate number of ancient horse genomes analysed in the 2021 study | (11) ________ |
| Trait identified in the Volga-Don horses, alongside a stronger back | (12) ________ |
| Type of vehicle found buried in graves at Sintashta | (13) ________ |
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7Question 7
اعرض الإجابة
3500 BCE
""a community of hunter-herders who lived in what is now northern Kazakhstan around 3500 BCE" (Paragraph B)"
ليش صحيح: التاريخ التقريبي المرتبط بثقافة Botai مذكور صراحة في نفس الجملة، وضمن حد الكلمتين.
ليش الباقي خطأ: التواريخ الأخرى المذكورة في النص (2200 BCE لساكنة الفولغا-الدون، 2000 BCE لـ Sintashta) تخص مواقع وفترات مختلفة تمامًا.
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8Question 8
اعرض الإجابة
mare's milk
""lipid residues extracted from cooking vessels contained fatty compounds matching mare's milk" (Paragraph B)"
ليش صحيح: هي الصياغة الحرفية للمادة المكتشفة.
ليش الباقي خطأ: "fat" أو "residue" وحدهما لا يحددان المادة كما يطلب الجدول.
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9Question 9
اعرض الإجابة
Przewalski's horse
""ancestral ... to the Przewalski's horse" (Paragraph C)"
ليش صحيح: الاسم المحدد صراحة كنتيجة الفحص الجيني.
ليش الباقي خطأ: "modern domestic horse" هو بالضبط ما نفاه النص، فهو مفخخ لمن لا يتتبع أداة النفي.
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10Question 10
اعرض الإجابة
2200 BCE
""around 2200 BCE" (Paragraph D)"
ليش صحيح: التاريخ المحدد صراحة لساكنة الفولغا-الدون.
ليش الباقي خطأ: 3500 BCE و2000 BCE يخصان مواقع أخرى (Botai وSintashta).
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11Question 11
اعرض الإجابة
200
""more than 200 ancient horse genomes" (Paragraph D)"
ليش صحيح: العدد التقريبي المذكور صراحة.
ليش الباقي خطأ: أي رقم آخر غير مدعوم بالنص؛ و"over 200" غير مقبولة لأن كلمة "over" ليست من النص (الذي يستخدم "more than")، والصياغة "more than 200" تتجاوز حد الكلمتين.
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12Question 12
اعرض الإجابة
docility
""two genes associated with docility" (Paragraph E)"
ليش صحيح: الصفة المذكورة صراحة إلى جانب الظهر الأقوى.
ليش الباقي خطأ: "stronger back" هي القيمة المعطاة في الجدول نفسه، وليست الفراغ المطلوب.
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13Question 13
اعرض الإجابة
spoke-wheeled chariots / chariots
""complete chariots, their wheels fitted with spokes rather than the solid wooden discs used earlier" (Paragraph F)"
ليش صحيح: مطابقة حرفية (الكلمة المركبة بشرطة تُحسب كلمة واحدة)؛ "chariots" وحدها مقبولة أيضًا لأن جملة Sintashta نفسها تنص على "complete chariots ... fitted with spokes".
ليش الباقي خطأ: "solid wooden discs" تصف العجلات الأقدم التي حلّت محلها هذه المركبات، فهي عكس الإجابة.