Today in our environmental science lecture, we'll discuss urban heat islands. Cities tend to be warmer than surrounding rural areas because concrete and asphalt absorb and re-emit heat. One major factor is the lack of vegetation, which normally provides shade and cools the air through evapotranspiration. Another contributor is waste heat from vehicles and air conditioning. Interestingly, a study in Phoenix found that painting rooftops white could reduce surface temperatures by up to 20 degrees Celsius, but the effect on air temperature was smaller. However, planting trees along streets proved more effective for lowering pedestrian-level heat, especially in residential areas.
❓ 강의에 따르면, 피닉스에서의 연구는 흰색 지붕에 대해 무엇을 밝혀냈습니까?
A. A) 그들은 표면 온도보다 기온을 더 많이 낮췄다.
B. B) 그들은 기온보다 지표면 온도에 더 큰 영향을 미쳤다.
C. C) 보행자 열을 낮추는 데 있어 가로수보다 더 효과적이었다.
D. D) 그들은 도시 기온에 큰 영향을 미치지 않았다.
✅ 正确答案
B) They had a greater effect on surface temperature than on air temperature.