狒狒逻辑27题

poorleafes

27. 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 properly 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 does heavy smoking.  

(C) A high-cholesterol diet is the principal cause of death in North America.  

(D) The only way that smoking increases one’s risk of fatal heart disease is by influencing the levels of cholesterol in the blood.  

(E) The risk of fatal heart disease can be altered by certain changes in lifestyle.

这边答案是E，可我感觉A也正确，还请大家帮忙分析一下A和E的细微差别之处==

poorleafes

如果A选项是否命题错误的话，我感觉E选项也是否命题啊，疑惑中==

jiuwang

可能问题是alter 这个词吧    而A里面是直接的一个反命题 E里面是间接的  我也纠结了很久 体会一下吧 还是有点区别的我感觉

poorleafes

alter：改变，修改。我感觉不应该是因为这个。

会不会是“can be ”的语气更倾向于推测，所以就与A有所不同，疑惑中。。。===

jianglxiang

觉得A选项可以这么理解：

原文中：The more cholesterol we have in our blood, the higher the risk that we

shall die of a heart attack。

若more cholesterol =A，higher the risk =B

则原文就是A推出B

而A选项中：low blood cholesterol可以认为是“非A”，lower the risk可以认为是“非B”

（近似，不是绝对的吧~~还应包括相同的情况）

那么A选项就是 非A 推出 非B

这个不就是典型错误嘛 （只有 非B 能推出 非A）

我这么理解的～～

jiuwang

但问题是 正确选项貌似也有这个意思