1 What problems does extreme heat cause?
① Heatstroke. ② Heart problems.
③ Stomachaches. ④ Aging faster.
A. ①②③ B. ②③④
C. ①③④ D. ①②④

2 How did the researchers measure people’s biological age?
A. By looking at their blood samples.
B. By checking their heart rate.
C. By looking at changes in their DNA.
D. By comparing their living areas.

3 What’s the meaning of the underlined word “Defining” in Chinese?
A. 给……下定义 B. 给……归类
C. 把……排除 D. 对……总结

4 What can we infer from the passage?
A. People in cooler areas never have health problems.
B. Smoking and drinking wine are not bad for biological aging.
C. As climate change continues, the problem of extreme heat will be more serious.
D. Older people don’t need any help in hot weather.

5 What is the main idea of the passage?
A. Extreme heat can lead to health problems like heatstroke and heart disease.
B. A new study shows that extreme heat may speed up biological aging.
C. Older adults are more likely to have health problems in extreme heat.
D. People can protect themselves from extreme heat in many ways.

1.D 细节理解题。由第一、二段可知，极端高温会使人中暑、患心脏病，也会加速衰老进程。
2.C 细节理解题。由第四段的第二句可知，研究人员通过观察 DNA 的变化来测量这些人的生物年龄。
3.A 词义猜测题。画线单词所在句子告诉我们什么样的温度才被称为极端高温，也就是说，本句话是给极端高温下定义。故画线单词的意思是“给……下定义”。
4.C 推理判断题。由最后一段最后一句可推知，随着气候变化，极端高温天数增加，问题会更严重。
5.B 主旨大意题。文章主要围绕新研究表明极端高温可能加速生物老化展开。选项 B“一项新的研究表明，极端高温可能会加速生物衰老。”最能概括文章的主要内容。