Question 15 is based on the passage you have just heard.

15. What is characteristic of people who live up to 100 years and beyond?

解析：C。本题目为细节题。问题为：活到100岁及以上的老人的特征是什么？原文所在句：People physically fit enough to survive over 100 years ultimately give in to diseases such as Alzheimer’s which affects the mind and cognitive function.人们身体上足够健康活到100岁，但是最终抵不过影响我们心理和认知功能的阿尔茨海默病。选项C) Their minds fall before their bodies do（他们的心智比身体先衰老），与文中信息一致。此题目难度较大，需要听懂原文长难句作答，也可使用排除法。B选项“生活的质量”、D选项“珍惜生活”，在文中都没有提到。A选项只提到了身体健康，属于信息缺失。