Narrator: Listen to part of a lecture in an environmental science class. Professor: Today we're discussing urban heat islands, a phenomenon where cities are significantly warmer than surrounding rural areas. One major cause is the replacement of natural surfaces with asphalt and concrete, which absorb and retain heat. Another factor is the lack of vegetation, since trees provide shade and release moisture through transpiration. Now, a common mitigation strategy is planting more trees, but recent studies suggest that simply increasing tree cover isn't enough. The placement and species of trees matter greatly. For instance, deciduous trees planted on the east and west sides of buildings can block summer sun while allowing winter sunlight through. However, in arid regions, water consumption by trees can be a concern. Therefore, planners must consider local climate, water availability, and building orientation. Effective urban design requires a holistic approach, integrating green spaces with reflective materials on rooftops and pavements. So, the key is not just adding green, but doing it intelligently.
❓ คำถาม What is the main point the professor makes about mitigating urban heat islands?
A. A) Planting as many trees as possible is the most effective strategy.
B. B) Trees should be avoided in arid regions due to water use.
C. C) The effectiveness of trees depends on their placement and species, and a holistic approach is needed.
D. D) Reflective materials on rooftops are more important than trees.
✅ คำตอบที่ถูกต้อง
C) The effectiveness of trees depends on their placement and species, and a holistic approach is needed.
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