[单项选择]男性，58岁，高血压12年，劳力性心前区疼痛2年。平时活动量稍大或上三楼时出现胸部疼痛，休息可缓解。近1个月发作频繁，1～2次／天，每次约持续15分钟左右，休息时也有发作。发作时心电图表现为ST段压低。该患者应该诊断为（）
A. 稳定型心绞痛
B. 不稳定型心绞痛
C. 变异性心绞痛
D. 主动脉夹层
E. 心肌梗死

Our theories about human disease are the product of current fashion 1. ______.
than we would like to admit. But just as the moment influences the hemline
and the automobile fender, so too a type of intellectual currency 2. ______.
affect our understanding of how illness happens. Much of
the 20th century is spent in pursuit of external causes of 3. ______.
disease - cigarettes, fatty foods, tick bites. Rather like the hero in an old western,
medicine’s work was to track down the bad guys, round them up 4. ______.
and squish them before a real commotion. Antibiotics, vaccines,
heart pi