Which function do the stone walls serve, according to the passage?
For centuries, farmers in mountain regions of South America have cut steps into steep hillsides and filled them with soil. These terraces slow the water that runs down a slope after heavy rain, which keeps the soil from being washed away. They also create small flat fields where crops can grow, and the stone walls store heat during the day and release it at night, which protects plants from frost. Many terraces are still in use today, but they need constant repair, and in some villages young people have moved to cities, leaving few hands to maintain the walls. As a result, some terraces have collapsed.
Answer and explanation
Correct answer: B. They absorb heat during the day and release it at night
- Step 1: The passage says the walls store heat by day and release it at night. Step 2. That protects plants from frost. Answer: They absorb heat during the day and release it at night. Why not the others: The other functions are not mentioned.
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