What is the author's purpose in the last sentence?
Long before modern machinery, farmers in the Andes learned to farm slopes that look far too steep for crops. They cut the hillside into a staircase of flat platforms held up by stone walls, and filled each platform with fertile soil. These terraces slow the run-off of rain, so the water soaks in instead of washing the soil downhill. The stone walls also store the heat of the day and release it at night, which protects plants from the cold of high altitude. Because each level sits at a slightly different height, farmers can grow different crops within a single hillside. Many terraces still produce food today, which shows how well the design suits the mountains.
Answer and explanation
Correct answer: B. To suggest that the old design remains suitable for the mountains
- Step 1: The last sentence says many terraces still produce food and shows how well the design suits the mountains.
- Step 2: This presents the old design as still suitable.
Answer
To suggest that the old design remains suitable for the mountains.
Why not the others: The sentence neither recommends machinery nor warns of failure nor describes construction.
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