Today in our environmental science lecture, we'll discuss urban heat islands. A recent study in Melbourne found that parks and green roofs can reduce local temperatures by up to 3 degrees Celsius. However, the effect is strongest within 500 meters of the green area. Interestingly, the cooling benefit is more noticeable at night than during the day, because vegetation releases stored moisture. The study also highlighted that tree canopy coverage is more effective than grass alone. So, for city planners, prioritizing tree planting in densely built areas is key.
❓ 根据讲座内容，墨尔本的研究发现绿地区域的降温效果如何？
A. A. 它在白天时最强。
B. B. 它仅在距离公园100米范围内有效。
C. C. 在夜间及500米范围内更为明显。
D. D. 草地比树冠更能有效降温。
✅ 正确答案
C. It is more noticeable at night and within 500 meters.