Passage Two
51. 正确选项A。 to see whether people’s personality affects their life span
52. 正确选项 D。 They are more likely to get overhardship.
53. 正确选项 C。 Such personality characteristics asself-discipline have no effect on longevity.
54. 正确选项 D。 Mothers’negative personality characteristics may affect their children’s life spans..
55. 正确选项 B。 Longevity results form a combination ofmental and physical health.​