单选题
A small piece of fish each day may keep the heart doctor away. That's the (67) of an extensive study of Dutch men in which deaths from heart disease were more than 50 percent (68) among those who consumed (69) an ounce of salt water fish per day than those (70) never ate fish. The Dutch research is one of three human (71) that give strong scientific backing to the long held (42) that eating fish can provide health benefits, (73) to the heart. Heart disease is the number-one killer in the United States, (74) researchers have noticed that the incidence of heart disease is lower in (75) that consume more fish than Americans (76) . There are fewer heart disease deaths, for example, among the Eskimos of Greenland, who (77) about 14 ounces of fish a day, and among the Japanese, (78) daily fish consumption averages more than 3 ounces. For 20 years, the Dutch study (79) 852 middle-aged men, 20 percent of whom ate no fish. (80) the start of the study, the average fish consumption was about two-thirds of an ounce each day (81) more men eating lean fish than fatty fish. During the next two decades, 78 of the men died (82) heart disease. The fewest deaths were among the group who regularly ate fish, (83) at levels far lower than (84) of the Japanese or Eskimos. This (85) was true regardless of other (86) such as age, high blood pressure, or blood cholesterol levels.