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

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