Today we're discussing the impact of urban green spaces. A recent study in Melbourne found that adding more trees to city streets can reduce summer temperatures by up to 2 degrees Celsius, but only if the trees are planted close to buildings. However, the same study noted that parks with grass alone have a smaller cooling effect. Interestingly, the researchers also discovered that green roofs on high-rise buildings are most effective for energy savings in winter, not summer. So, for maximum benefit, cities should prioritize street trees near residential areas rather than large distant parks.
❓ 根据讲座内容，墨尔本的研究关于街道树木发现了什么？
A. A. 它们在冬季节能方面最为有效。
B. B. 它们只有在种植于建筑物附近时才会降低温度。
C. C. 它们的降温效果不如草地公园。
D. D. 为了获得最佳效果，它们应种植在大型且彼此间距较远的公园中。
✅ 正确答案
B. They reduce temperatures only when planted near buildings.