标题: 费费135中第27题,马上考试了,请大家帮忙~ [打印本页] 作者: sophiewu 时间: 2010-2-6 17:36 标题: 费费135中第27题,马上考试了,请大家帮忙~ These days, drug companies and health professionals alike are focusing their attention on cholesterol in the blood. The more cholesterol we have in our blood, the higher the risk that we shall die of a heart attack.The issue is pertinent since heart disease kills more North Americans every year than any other single cause. At least three factors--smoking, drinking, and exercise-- can each influence levels of the cholesterol in the blood. which one of the following can be proprly concluded from the passage? A. If a person has low blood cholesterol, then that person's risk of fatal heart disease is low. b. Smoking in moderation can entail as great a risk of fatal heart disease as dose heavy smoking. c. A high-cholesterol diet is the principal cause of death in North America. d. The only way that smoking increase one's risk of fatal heart disease is by influencing the levels of cholestrerol in the blood. e. The risk of fatal heart disease can be altered by centain changes in lifestyle.