L1
讲座
1. What is the main purpose of the lecture?
To evaluate claims about a possible cause of global warming
To interpret the findings of a recent study on heat islands
To examine an important consequence of urbanization
To describe ways that cities are reducing their heat-island effect
2. What example does the professor give of an environmentally beneficial feature of a city building?
All-glass building facades
Vegetation around a building
Nonmetallic outer walls
Heat-reflecting roofs
3. Why does the professor show an image of Atlanta, Georgia?
To reinforce his explanation of what causes heat islands
To illustrate an unusual feature of Atlanta’s heat-island effect
To support his claim that heat islands can occur at any time of year
To show results of Atlanta’s efforts to reduce its heat islands
4. What is the “maximum heat-island effect”?
The time of year when most heat islands can be expected to form
The greatest difference in temperature between an urban area and a nearby rural area
The greatest distance between one heat island and the next nearest heat island
The highest temperature that a heat island reaches on a typical summer day
5. What comparison does the professor make between the effects of heat islands in summer and the effects of heat islands in winter?
The harmful effects of heat islands are more difficult to measure in winter than in summer
The harmful effects of heat islands are easier to reduce in summer than in winter
The harmful effects of heat islands in summer are generally greater than the benefits of heat islands in winter.
Heat islands have equally harmful effects in summer and in winter.
6. What does the professor indicate about the relationship between heat islands and global warming?（多选题）
The number of heat islands worldwide is increasing as a result of global warming
The presence of heat islands complicates the study of global warming
Heat islands do not contribute directly to global warming.
Heat islands are becoming more difficult to identify as a result of global warming.
