Question 23 is based on the passage you have just heard.

Passage Three

    (23)An distressing childhood can lead to heart disease. What about current stresses? Longer workouts, threats of layoffs, collapsing pension funds. A study last year on the lancer examine more than11,000 heart attack suffers from 52 countries. It found that in the year before their heart attacks, patients had been under significantly more strains than some 30,000 healthy control subjects. Those strains came from work, family, financial troubles, depression and other causes. "Each of these factors individually was associated with increased risk," says Doctor Salim Yussef, Professor of medicine and candidates McMaster University and senior investigator on the study. Together, they accounted for 30% to overall heart attack risk. But people respond differently to high-pressure work situations, whether it produces hard problems seems to depend on whether you have a sense of control over life or live at the mercy of circumstances and superiors. That was experiences of Jano Cano, a rock food Illinois laboratory manager, who suffered his first heart attack in 1996 at the age of 56. (24)In the 2 years before, his mother and 2 of his children had suffered serious illnesses, and his job had been changed in a reorganization. "My life seemed completely out of control," he says, "I had no idea where I would end up." He ended up in hospital due to a block in his artery. 2 months later, he had a triple by-pass surgery. The second heart attack when he was 58, left his doctor shaking his head. "There's nothing more we can do for you," doctors told him。

23. What does the passage mainly discuss?

解析：四个选项都是两个名词，推测题目与主题或两者关系有关。录音开篇就提到压力和心脏病，接下来详细阐述了两者的关系。故B选项“压力和心脏病”为正确答案。