Today, in our environmental science lecture, we'll discuss the impact of urban green spaces. A recent study in Melbourne found that adding more parks and trees can reduce the city's temperature by up to 4 degrees Celsius during heatwaves. This cooling effect is mainly due to shade and evapotranspiration. However, the study also noted that the benefits are strongest when green spaces are evenly distributed, rather than concentrated in a few wealthy areas. Interestingly, the researchers emphasized that even small community gardens can have a significant impact, but they need to be maintained properly to ensure long-term effectiveness.
❓ 根据讲座内容，墨尔本的研究对城市绿地有何发现？
A. A. 在热浪期间，它们能使城市温度降低多达4度。
B. B. 它们集中在中央商务区时效果最佳。
C. C. 除非是大型公园，否则它们没有显著影响。
D. D. 它们主要有助于减少空气污染，而非降低温度。
✅ 正确答案
A. They can lower city temperatures by up to 4 degrees during heatwaves.