What can be inferred about green roofs from the last sentence?
Cities are often several degrees warmer than the countryside around them. Dark roads and roofs absorb sunlight during the day and release it slowly at night, while concrete and glass leave little room for plants that cool the air by releasing water vapour. Planners call this effect the urban heat island. One measure that has attracted attention is the green roof, a layer of soil and vegetation placed on top of a building. Studies of green roofs show that they can lower the temperature of the roof surface and reduce the energy used for air conditioning. However, they are expensive to install, need regular maintenance, and work best in combination with other measures, such as planting trees along streets.
Answer and explanation
Correct answer: A. They are not a complete solution and are likely to be used together with other measures.
- Step 1: The last sentence lists drawbacks (cost, maintenance) and says they work best with other measures. Step 2. So the reader can infer that green roofs alone will not solve the problem. Answer: They are not a complete solution and are likely to be used together with other measures. Why not the others: The text says they are expensive, not cheap; it does not say they harm buildings; it never links them to cool climates.
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