Listen to part of a lecture in an environmental science class. Professor: Today we're discussing the impact of urban heat islands, a phenomenon where cities are significantly warmer than surrounding rural areas. This happens because materials like concrete and asphalt absorb and re-emit heat more than natural landscapes. One major consequence is increased energy consumption for cooling, which in turn raises greenhouse gas emissions. But there are strategies to mitigate this effect. For instance, planting trees and creating green roofs can provide shade and release moisture, cooling the air. Additionally, using reflective materials on pavements and buildings can reduce heat absorption. Some cities have implemented 'cool pavement' programs, coating roads with a light-colored sealant that reflects solar radiation. While these measures are promising, they require careful planning and investment. However, the benefits extend beyond temperature reduction, including improved air quality and reduced health risks during heatwaves. So, as urban populations grow, we must consider these solutions essential for sustainable development.
❓ Question What is the main purpose of the lecture?
A. To explain why urban areas are hotter and discuss solutions
B. To compare urban and rural energy consumption
C. To describe the health risks of heatwaves
D. To discuss the history of city planning
✅ Correct Answer
To explain why urban areas are hotter and discuss solutions
TOEFL Listening Tips
Skim the questions first to predict the content
Watch for signal words in lectures and conversations (however, actually, in fact)
For main idea questions, focus on the beginning; for detail questions, focus on examples and data
For attitude questions, pay attention to the speaker's tone and word choice
Take notes on keywords; don't try to write down every word
