Today, in our environmental science lecture, we'll discuss the impact of urban farming. One key point is that rooftop gardens can reduce a building's energy consumption by up to 25% because they provide natural insulation. However, the initial cost of setting up such a garden is often high, and maintenance requires regular watering, especially in dry seasons. A study in Chicago found that community gardens also improve local air quality, but they need at least two years to show measurable effects. So, while the benefits are clear, planning and investment are crucial.
❓ 根据讲座内容，屋顶花园的一个主要好处是什么？
A. A. 它们通过提供隔热来减少能源消耗。
B. B. 它们设置后所需水分极少。
C. C. 它们立即改善当地空气质量。
D. D. 它们初期安装成本低廉。
✅ 正确答案
A. They reduce energy use by providing insulation.