Today in our environmental science lecture, we're discussing urban green spaces. A recent study in Melbourne tracked the effects of adding rooftop gardens to city buildings. The researchers measured temperature, air quality, and biodiversity over two years. They found that rooftop gardens reduced local temperatures by up to 3 degrees Celsius in summer, but only when the gardens covered at least 60% of the roof area. Additionally, bird species increased by 15% in areas within 500 meters of these gardens. However, the study noted that maintenance costs were higher than expected, mainly due to irrigation needs. The key takeaway is that green roofs require careful planning to maximize benefits.
❓ この研究は、屋上庭園の有効性について何を示唆していますか？
A. A. 最低限の屋根面積が覆われた場合にのみ、それらは温度を下げる。
B. B. 彼らは庭の大きさに関係なく鳥類の種数を増加させる。
C. C. メンテナンスの必要性が低いため、費用対効果が高い。
D. D. それらは大気質に影響を与えない。
✅ 正确答案
A. They reduce temperatures only if a minimum roof area is covered.