Narrator: Listen to part of a lecture in an environmental science class.
Professor: So today we’re talking about urban heat islands, a phenomenon where cities are significantly warmer than surrounding rural areas. One major cause is the replacement of natural surfaces with materials like concrete and asphalt, which absorb and retain heat. Another factor is the lack of vegetation, which normally provides shade and cools the air through evapotranspiration. Now, a common solution is planting more trees, but recent studies suggest that the effectiveness depends on the tree species and placement. For example, trees with broad canopies are better at shading buildings, but they may also trap heat if planted too close together, reducing wind flow. Additionally, reflective roofing materials can help, but they are most effective in regions with hot summers and mild winters. So, when designing green infrastructure, we need to consider local climate and urban layout, not just the number of trees.
❓ Question What does the professor imply about planting trees as a solution to urban heat islands?
A. It is always the most effective solution in any climate.
B. Its effectiveness depends on tree type and arrangement.
C. It is less effective than using reflective roofing materials.
D. It works best in regions with cold winters.
✅ Correct Answer
Its effectiveness depends on tree type and arrangement.
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
