So how does it work? The effects are complex, affected by socio-economic factors,health-service provision, emotional support and other more physiological (生理的) mechanisms. For example, social contact can boost development of the brain and immune system, leading to better health and less chance of depression later in life. People in supportive relationships may handle stress better. Then there are the psychological benefits of a supportive partner.

　　A life partner, children and good friends are all recommended if you aim to live to 100. The ultimate social network is still being mapped out, but Christakis says: ―People are interconnected, so their health is interconnected.‖

　　62. William Farrs study and other studies show that _________.

　　[A] social life provides an effective cure for illness

　　[B] being sociable helps improve ones quality of life

　　[C] women benefit more than men from marriage

　　[D] marriage contributes a great deal to longevity

　　63. Linda Waites studies support the idea that _________.

　　[A] older men should quit smoking to stay healthy

　　[B] marriage can help make up for ill health

　　[C] the married are happier than the unmarried

　　[D] unmarried people are likely to suffer in later life

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