If you encounter a long text with 6 paragraphs:

Since the actual passage varies by test date, I have reconstructed a based on real IELTS patterns (e.g., Cambridge 7 Test 2, Cambridge 11 Test 2, and real exam recalls), followed by the most common question types and their correct answers .

For a long time, archaeologists believed prehistoric paintings were created in a single session. However, new research led by Dr. Alistair Pike from Bristol University suggests these sites were "living" canvases. Using uranium series dating , scientists found that some paintings in the Altamira cave in Spain were updated and added to over a span of up to 20,000 years.

Passage 1: Prehistoric Cave Paintings Took up to 20,000 Years to Complete This text focuses on new dating techniques, specifically Uranium-series dating

A major hurdle in studying this art has been dating accuracy. Traditional carbon dating measures the age of the charcoal used. But since artists could have picked up old charcoal from the cave floor, the "date" might reflect when the wood burned, not when the artist painted. Uranium series dating solves this by testing the calcium carbonate layer that grows over the art.

: Dr. Pike uses this technique, which relies on the layer of calcium carbonate (stalactites/stalagmites) that forms over the paintings. Summary of Key Findings for "Deep" Features

30,000 / 32,000 (always check the unit—years BCE or years ago).

Ultimately, the existence of cave art marks the point where Homo sapiens began to think abstractly. It proves that our ancestors were capable of storing information outside the human brain, a precursor to the development of writing systems. Understanding this art is crucial for reconstructing the social structures and mental lives of early humans.