Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne found that increasing tree canopy cover by 20% could reduce summer street temperatures by up to 4 degrees Celsius. However, the researchers noted that this effect is strongest in residential areas with low-rise buildings, not in high-density city centers. They also emphasized that maintenance costs are often underestimated, and recommended using native species which require less water. Interestingly, community involvement in planting programs was shown to increase the survival rate of young trees by nearly 30%.
❓ 講義によると、メルボルンの研究は樹冠被覆についてどのような結論を導き出したのでしょうか？
A. A. 密集した都市中心部で最も効果的に気温を低下させます。
B. B. 低層住宅地において最も大きな冷却効果を持つ。
C. C. 効果を発揮するには高度なメンテナンスが必要である。
D. D. それは非在来種の樹木にのみ機能する。
✅ 正确答案
B. It has the greatest cooling effect in low-rise residential areas.