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）。Giles's team set out to examine the relationship between various types

　　of social networks and______（9） in a group of almost 1 ，500 Australians who were at least 70 years______（10）。 Volunteers answered______（11）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 ，______（12） sex， age， health and smoking status.What the study showed was______（13） older people who reported better social networks of friends were______（14） 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______（15） effect on survival in the study.

　　1 A live B die C work D stay

　　2 A stronger B larger C newer D poorer

　　3 A which B whom C those D who

　　4 A at B to C on D by

　　5 A by B on C of D in

　　6 A is B are C was D were

　　7 A However B Once C Further D Moreover

　　8 A older B richer C some D other

　　9 A loneliness B longevity C activity D happiness

　　10 A big B long C old D ago

　　11 A doubts B questions C studies D tests

　　12 A taking B including C accepting D offering

　　13 A if B when C this D that

　　14 A less B more C very D most

　　15 A each B every C an D all

同时按下Crtl键和A键查看答案

1. B　　2. D　　3. D　　4. B　　5. C 6. B　　7. A　　8. D　　9. B　　10. C 11. B　 12. B　 13. D　 14. B　 15. C