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.
❓ Согласно лекции, что выявило исследование в Финиксе о белых крышах?
A. A) Они снизили температуру воздуха в большей степени, чем температуру поверхности.
B. B) Они оказали большее влияние на температуру поверхности, чем на температуру воздуха.
C. C) Они были более эффективны, чем уличные деревья, в снижении жары для пешеходов.
D. D) Они не оказали значительного влияния на температуру в городах.
✅ 正确答案
B) They had a greater effect on surface temperature than on air temperature.