Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that parks can reduce local temperatures by up to 4 degrees Celsius during heatwaves. However, the cooling effect depends on tree canopy coverage. Areas with less than 30% canopy showed minimal temperature differences. Interestingly, the study also noted that residents living within 500 meters of a large park reported better mental health, but only if the park had maintained walking paths. Without these paths, usage dropped significantly, especially among elderly people.
❓ 講義によると、公園が顕著な冷却効果を持つために必要な条件は何ですか？
A. A. その公園は直径500メートル以上でなければならない。
B. B. 公園は少なくとも30%の樹冠被覆率を有していなければならない。
C. C. 公園には整備された歩行者用の遊歩道が含まれていなければならない。
D. D. 公園は住宅地に位置しなければならない。
✅ 正确答案
B. The park must have at least 30% tree canopy coverage.