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第6部分：完形填空(第51～65题，每题1分，共15分) 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 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). Giless 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. | 
