LAST 逻辑两题讨论！

Thorny

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.

答案是E. 我觉得是A. 因为lifestyle 一说象是新概念。请教各位！

28. Ordinary mountain sickness, a common condition among mountain climbers, and one from which most people can recover, is caused by the characteristic shortage of oxygen in the atmosphere at high altitudes. Cerebral edema, a rarer disruption of blood circulation in the brain that quickly becomes life-threatening if not correctly treated from its onset, can also be caused by a shortage of oxygen. Since the symptoms of cerebral edema resemble those of ordinary mountain sickness, cerebral edema is especially dangerous at high altitudes.
Which one of the following is an assumption on which the argument depends?
(A) The treatment for ordinary mountain sickness differs from the treatment for cerebral edema.
(B) Cerebral edema can cause those who suffer from it to slip into a coma within a few hours.
(C) Unlike cerebral edema, ordinary mountain sickness involves no disruption of blood circulation in the brain.
(D) Shortage of oxygen at extremely high altitude is likely to affect thinking processes and cause errors of judgment.
(E) Most people who suffer from ordinary mountain sickness recover without any special treatment.

答案是 A. 我选C. 因为文中说disruption of blood circulation 是life-threatening 的。而mountain sickness没有说到。

ironfish

27. smoking, drinking, and exercise are all lifestyles.

albert

1. smoking, drinking, and exercise    all of those are various forms of life style
"The more cholesterol we have in our blood, the higher the risk that we shall die of a heart attack"
A is wrong because from the sentence above we can't safely conclude that if the cholesterol in blood is low, the risk of heart attack will certainly be low ..because maybe other factors will lead to heart attack...low in cholesterol is only a required condition for the health, but is not a sufficient condition...  the difference between reuqired condition and sufficient is the key to eliminate choice A

2. you should notice the relation between evidence and conclusion to sovle this problem.
choice A eliminate other possibilities of weakening the conclusion
could you expain the reason you choose C in detail?

Thorny

因为文中说disruption of blood circulation 是life-threatening 的。而mountain sickness没有说到有这个现象，所以，我想因为这个区别，才使cerebral edema especially dangerous.

不过，现在看来，mountain sickness 之所以能恢复也是由于treatment,所以，A应该是首选。

嗯，谢谢两位大虾！