These days, drug companies and health professionals alike arefocusing their attention on cholesterol in the blood. The more cholesterol wehave in our blood, the higher the risk that we shall die of a heart attack. Theissue is pertinent since heart disease kills more North Americans every yearthan any other single cause. At least three factors---smoking, drinking, andexercise—can each influence levels of the cholesterol in the blood.

　　Which one of the following can be properly concluded from thepassage?

　　A. If person has low blood cholesterol, then thatperson’s risk of fatal heart disease is low.

　　B. Smoking in moderation can entail asgreat a risk of fatal heart disease as doe’s heavy smoking.

　　C. A high-cholesterol diet is theprincipal cause of death in North America.

　　D. The only way that smoking increases one’s riskof fatal heart disease is by influencing the levels of cholesterol in theblood.

　　E. The risk of fatal heart disease canbe altered by certain changes in lifestyle.

　　答案

　　答案是E。解释：

　　A. 原文中说，胆固醇越高，生心脏病的可能性越大。A选项的内容是否命题，不一定成立。

　　B. 原文中没有提到此相关信息。

　　C. 显然不对，因为文中结尾明显说抽烟、饮酒和缺少运动也可以影响血液中胆固醇水平，所以不能保证C是正确的。

　　D. 文中没有说是only way哦。

　　E. 就是它了。可以通过调整抽烟、饮酒、运动等生活方式来减少心脏病的可能性。

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