Read the excerpt:
Cities are often several degrees warmer than the countryside around them, because concrete and asphalt absorb heat during the day and release it at night. One response is the green roof: a layer of soil and plants laid on top of a building. The plants shade the roof and cool the air as water evaporates from their leaves. Green roofs also hold rainwater, which reduces flooding in the streets below. However, they add weight, so older buildings may need to be strengthened first.
Which of the following is NOT mentioned in the excerpt as a benefit of green roofs?
Answer and explanation
Correct answer: D. Lower electricity bills
- Step 1: The excerpt lists shade, cooling of the air through evaporation and reduced street flooding. Step 2. Electricity bills are never mentioned. Answer: Lower electricity bills. Why not the others: Shade, cooler air and less flooding in the streets are all stated in the excerpt as benefits of green roofs.
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