Good morning, everyone. Today, we're going to discuss the role of urban parks in reducing heat island effects. A recent study in Melbourne compared three types of green spaces: small gardens, medium-sized parks, and large forested areas. The researchers measured air temperature during a heatwave. Surprisingly, the small gardens had a cooling effect of only 1 degree Celsius, while the medium parks reduced temperatures by 3 degrees. However, the large forested areas showed the most significant drop, up to 5 degrees, but only if the tree canopy was dense. The study also noted that water features, such as ponds, did not enhance cooling unless combined with shade.
❓ 根据讲座内容，关于绿地降温效应的主要发现是什么？
A. A. 小花园比中型公园更为有效。
B. B. 拥有茂密树冠的大面积森林区域提供了最强的降温效果。
C. C. 仅水景一项就能显著降低温度。
D. D. 所有绿色空间都具有相同的降温效果。
✅ 正确答案
B. Large forested areas with dense canopy provided the greatest cooling.