A new study shows that women can reduce their chances of developing heart disease by jogging for about three hours every week. The researchers at Harvard University Medical in Boston have just reported the results of the study on the New England Journal of Medicine. The study is the first to show the effectiveness of jogging in the developing of heart disease in women. Only a few earlier studies have examined the effects of jogging on the heart, but nearly all have been done on men. The new study involves more than 72,000 women between the ages of forty and sixty-five during a period of eight years. The researchers have found that women who jog at least three hours a week have a thirty to forty percent lower chance of suffering a heart attack than those who do not. 26. The new study is about __________. 1 điểm A. men and heart attack B. effects of jogging on women’s heart C. men and jogging D. medicine in Harvard University 27. Who have done the research? 1 điểm A. The journalists on the New England Journal of Medicine B. The researchers at Harvard University Medical in Boston C. Women between the ages of forty and sixty-five D. Some joggers 28. How many hours should women jog at least a week to reduce heart attacks? 1 điểm A. 3 B. 40 C. 65 D. 72 29. Most of the early studies have been done on __________. 1 điểm A. babies B. children C. women D. men 30. How long does the new research take? 1 điểm A. 3 years B. 8 years C. 10 years D. 12 years