Listen to part of a lecture in an environmental science class. Professor: Today we're discussing the concept of 'urban heat islands.' As cities grow, they replace natural landscapes with concrete, asphalt, and buildings. These materials absorb and retain heat much more than vegetation does. At night, while rural areas cool down, cities may stay several degrees warmer. This phenomenon affects energy consumption, air quality, and even human health. One surprising solution is planting more trees and creating green roofs. Trees provide shade and release moisture through transpiration, which cools the air. However, the placement of trees is crucial. Studies show that shading a building's walls and windows can reduce cooling costs by up to 30%. But trees planted too close to structures may cause damage or block winter sunlight, increasing heating needs. So, urban planners must balance benefits and drawbacks. What is the main point the professor makes about trees?
❓ คำถาม What is the main point the professor makes about trees?
A. Trees are the only effective way to reduce urban heat.
B. Trees help cool cities, but their placement requires careful consideration.
C. Trees should never be planted near buildings because of damage risks.
D. Trees have little effect on urban temperatures compared to other methods.
✅ คำตอบที่ถูกต้อง
Trees help cool cities, but their placement requires careful consideration.
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