Today in our environmental science lecture, we'll discuss the impact of urban green spaces on air quality. A recent study in Melbourne monitored two parks over a year. The researchers found that trees, especially broad-leaved species like oaks, reduced particulate matter by up to 30% near busy roads. However, the effect was only significant within 50 meters of the green area. Interestingly, the study also noted that grass areas had a minimal effect compared to tree canopies. The lead researcher, Dr. Emily Watson, suggests that city planners should prioritize planting clusters of trees rather than isolated ones to maximize air purification benefits.
❓ 根据讲座内容，墨尔本的研究揭示了城市绿地对什么影响？
A. A. 在减少污染方面，草地比树木更为有效。
B. B. 在繁忙道路50米范围内，树木使颗粒物减少了30%。
C. C. 对空气质量的影响在距离绿地50米以外最为显著。
D. D. 孤立的树木比成片的树木更有益。
✅ 正确答案
B. Trees reduced particulate matter by 30% within 50 meters of busy roads.