Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that parks reduce local temperatures by up to 4 degrees Celsius during heatwaves. However, the benefit depends on tree canopy coverage. Areas with less than 30% canopy showed minimal cooling. Interestingly, the study also noted that the presence of water features, like ponds, had a stronger effect than grass alone. But the most surprising finding was that small, scattered gardens in residential streets were more effective at lowering nighttime temperatures than a single large park. This is because they provide continuous shade and moisture throughout the city.
❓ 根据讲座内容，该研究最出乎意料的发现是什么？
A. A. 公园能使气温降低4摄氏度。
B. B. 水景比草地更能降低空气温度。
C. C. 小型街道花园在降低夜间温度方面比单一大型公园更为有效。
D. D. 树冠覆盖率低于30%时，效果甚微。
✅ 正确答案
C. Small street gardens cool nighttime temperatures better than one big park.