答案：【解析】：这是一道英语阅读理解判断题，需要阅读关于热浪的材料，然后判断给出的句子是否正确。主要考查对文章细节的理解和信息提取能力。
1. 对于第一题“Heatwaves can last a few hours or days.”，我们需要从文章中找到关于热浪持续时间的信息。文章中明确提到“Heatwaves can last a few days or even weeks.”，因此可以判断该句是错误的。
2. 第二题“Climate change is one of the reasons why heatwaves are happening more often.”涉及热浪发生频率增加的原因。文章中提到“Heatwaves are happening more often and becoming more harmful to people and the environment. Climate change: As temperatures around the world rise, extreme heat is getting more common.”，因此该句是正确的。
3. 第三题“Roads and buildings trap heat, so cities are usually hotter than nearby areas.”讨论城市热岛效应的原因。文章中明确提到“Urban heat island effect: Cities are usually a little hotter than nearby areas. This is because roads and buildings trap a lot of heat.”，所以该句是正确的。
4. 第四题“In 2022, the Pacific Northwest heatwave hit many cities in Canada and the USA.”涉及一个具体的时间事件。文章中提到的是“In 2021, a very bad heatwave hit the Pacific Northwest area of North America.”，因此该句是错误的。
5. 第五题“It’s better to open windows during the day to let fresh air in and cool down your home.”是关于在热浪期间如何保持家中凉爽的建议。文章中建议“Keep your home cool: Close windows and curtains during the day to keep heat out.”，因此该句是错误的。
【答案】：
1. F；正确的信息是：Heatwaves can last a few days or even weeks.
2. T
3. T
4. F；正确的时间是2021年，不是2022年。
5. F；正确的做法是：在白天关闭窗户和窗帘以隔绝热量。