Today, in our environmental science lecture, we'll discuss urban green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to 4 degrees Celsius during heatwaves. This cooling effect is mainly due to shade and evapotranspiration from trees. However, the researchers noted that the benefit is strongest within 100 meters of the park. Beyond that distance, the temperature difference drops significantly. Also, they observed that larger parks with diverse tree species provide more consistent cooling than smaller, grassy areas. So, for city planners, it's not just about having green spaces, but their size and design matter.
❓ 根据讲座内容，墨尔本的研究对城市公园有何发现？
A. A. 公园只有在面积超过100米时才能降低温度。
B. B. 冷却效应在公园周边100米范围内最为显著。
C. C. 草地面积在降温方面比树木覆盖区域更为有效。
D. D. 所有公园无论设计如何，都具有相同的降温效果。
✅ 正确答案
B. The cooling effect is most noticeable within 100 meters of a park.