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.
❓ Согласно лекции, какое условие необходимо для того, чтобы парк оказывал значительный охлаждающий эффект?
A. A. Парк должен быть более 500 метров в диаметре.
B. B. Парк должен иметь как минимум 30% покрытия древесным пологом.
C. C. В парке должны быть поддерживаемые пешеходные дорожки.
D. D. Парк должен располагаться в жилой зоне.
✅ 正确答案
B. The park must have at least 30% tree canopy coverage.