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完形填空 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 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 ______(1)over a 10-year follow-up(随访) period than older people with______(2)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______(3) rely on their children and other relatives ，having a large network of relatives was not associated with longer life，according______ (4) Giles and her colleagues.Of course， that is not to say that social networks______ (5) children and other relatives are not important in many other ways， Giles said.Study after study has shown that elderly people who______ (6) connected with lots of people tend to live longer lives.______(7)， few studies have examined whether different types of relationships - with friends ， partners ， children and______ (8) relatives - have different effects on longevity(长寿)。Giless team set out to examine the relationship between various types | 
