[A] adjustments [B] attraction [C] compared [D] disabled [E] involved

[F] lifestyles [G] outlook [H] pessimistic [I] primarily [J] related

[K] releasing [L] significantly [M] suffering [N] surviving [O] unhappy

Studies suggest optimists live longer and enjoy better health than pessimists. The real mystery is why. Highly optimistic people have【C1】_____lower death rates. People with positive emotions have lower blood pressure. The most【C2】__men are more than twice as likely to develop heart disease【C3】_____with the most optimistic.

But is it optimism that makes people healthy, or do healthy people understandably have a brighter【C4】________?

To get a better handle on things, scientists have adjusted their analysis in recent years to count pre-existing medical conditions. Studies that made these【C5】________found that existing illnesses don’t negate the benefits of optimism.

In one example of explaining how humans keep their spirits up, researchers found older people【C6】_____various illnesses still said they thought they were aging well. Another study found that the sick and【C7】_____don’t wallow in misery as is commonly believed.

But why is optimism so beneficial? Perhaps optimists enjoy better health and longer lives because they lead healthier【C8】_____, build stronger social support networks, and get better medical care, the Health Watch article suggested. Also, stress is known to kill,【C9】__hormones that cause deterioration (恶化) of everything from your gums to your heart. Optimists might have lower levels of stress hormones. More study is needed, the Health Watch article says, because it’s likely that multiple mechanisms are【C10】_____.

【C7】