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）.
　
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.
　
51 A live           B die          C work           D stay
52 A stronger    B larger       C newer        D poorer
53 A which        B whom      C those         D who
54 A at             B to            C on             D by
55 A by             B on           C of              D in
56 A is              B are           C was           D were
57 A However    B Once        C Further      D Moreover
58 A older         B richer         C some        D other
59 A loneliness   B longevity    C activity      D happiness
60 A big            B long          C old            D ago
61 A doubts      B questions    C studies      D tests
62 A taking        B including    C accepting   D offering
63 A if              B when         C this           D that
64 A less           B more         C very           D most
65 A each         B every         C an             D all

答案:
51 B　52 D　53 D　54 B　55 C

56 B　57 A　58 D　59 B　60 C

61 B　62 B　63 D　64 B　65 C