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.
❓ Según la conferencia, ¿qué condición es necesaria para que un parque tenga un efecto de enfriamiento significativo?
A. A. El parque debe tener más de 500 metros de diámetro.
B. B. El parque debe tener al menos un 30% de cobertura de copa de árboles.
C. C. El parque debe incluir senderos para caminar que estén en buen estado.
D. D. El parque debe estar ubicado en una zona residencial.
✅ 正确答案
B. The park must have at least 30% tree canopy coverage.