题目内容：
回答题：Friends May Be Key to Living Longer Looking for the secret of a long life? Look closely at your friends. New research suggests that having a strong network of friends helps people live longer.
"Older people with better social networks of friends were less likely to_______（51）
over a 10-year follow-up （随访） period than older people with_______（52） friends networks," Lynne C. Giles of Flinders University in Australia told Reuters Health.
But in what may come as a surprising finding to older people_______（53） rely on their children and other relatives, having a large network of relatives was not associated with longer life, according_______（54） Giles and her colleagues.
"Of course, that is not to say that social networks_______（55） children and other relatives are not important in many other ways," Giles said.
Study after study has shown that elderly people who_______（56） connected with lots of people tend to live longer lives._______（57）, few studies have examined whether different types of relationships - with friends, partners, children and _______（58） relatives - have different effects on longevity （长寿）.
Giles's team set out to examine the relationship between various types of social networks and_______（59） in a group of almost 1,500 Australians who were at least 70 years_______（60）. Volunteers answered_______（61） about their social networks and then were followed for 10 years.
The researchers took into account several factors that could have influenced how long a person lived,_______（62） sex, age, health and smoking status.
What the study showed was_______（63） older people who reported better social networks of friends were_______（64） likely to be alive at the end of the study than people with fewer friends.
But relationships with children and other relatives did not have_______（65） effect on survival in the study.
A．live
B．die
C．work
D．stay
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