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 four degrees Celsius during heatwaves. However, the cooling effect depends on tree canopy coverage, not just grass areas. The researchers also noted that residents living within 300 meters of a large park reported better mental health. Interestingly, smaller pocket parks had less impact on temperature but were more accessible for daily walks. So, when designing sustainable cities, planners should prioritize a network of varied green areas rather than a single large park.
❓ 根据讲座内容，墨尔本的研究揭示了大型公园的哪些情况？
A. 它们比小型公园更能有效降低温度。
B. 只有当树木覆盖足够时，它们才具有降温效果。
C. 它们对心理健康的益处不如袖珍公园。
D. 它们总是位于居民区300米范围内。
✅ 正确答案
They have a cooling effect only when tree coverage is sufficient.