Today, in our environmental science lecture, we will discuss the impact of urban heat islands. A recent study in Melbourne found that planting more trees in city centers can reduce surface temperatures by up to 4 degrees Celsius during summer afternoons. However, the effect is less significant at night, when heat stored in buildings and roads is slowly released. The study also highlighted that green roofs, though more expensive to install, provide better insulation in winter than street trees. Interestingly, the researchers noted that light-colored pavements reflect more sunlight than dark ones, but they do not cool the air as effectively as trees do.
❓ 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) 在夏季午后，它们能使地表温度降低多达4摄氏度。
B. B) 它们在夜间冷却空气的效果比白天更有效。
C. C）它们比绿色屋顶提供更好的冬季保温效果。
D. D) 它们比浅色路面反射更多的阳光。
✅ 正确答案
A) They reduce surface temperatures by up to 4 degrees Celsius during summer afternoons.