51. The aim of the study in the Journal of the American Geriatrics Society is.
- A. to see whether people's personality affects their life span
- B. to find out if one's lifestyle has any effect on their health
- C. to investigate the role of exercise in living a long life
- D. to examine all the factors contributing to longevity
答案：A
答案句：A new study in the Journal of the American Geriatrics Society looked at this question by examining the personality characteristics of 246 children of people who had lived to be at least 100. … But what effect does your personality have on your longevity(长寿)? Do some kinds of personalities lead to longer lives?
参考译文：《美国老年医学会杂志》上的一项新研究通过考察246位活到至少100岁的人的子女的性格特征来研究这个问题。 … 但是你的性格对你的长寿有什么影响呢？某些类型的性格会让人更长寿吗？
定位线索：题干“The aim of the study in the Journal of the American Geriatrics Society”→答案句取自第1段“A new study in the Journal of the American Geriatrics Society looked at this question”；文中“what effect does your personality have on your longevity”对应选项A“whether people's personality affects their life span”。
解析：题干问研究目的，答案句明确指出该研究“looked at this question”，而“this question”指前文“what effect does your personality have on your longevity”，即研究性格对寿命的影响，对应A项。B项“lifestyle”、C项“exercise”、D项“all the factors”均与原文不符，属于无中生有或范围扩大。