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题库 / Prep2007E1-CR-14
The higher the level of certain vitamins and minerals in the bloodstream, the better a person's lung function, as measured by the amount of air the person can expel in one second. The lung function of smokers is significantly worse, on average, than that of nonsmokers. Clearly, therefore, one way for smokers to improve their lung function is for them to increase their intake of foods that are rich in these helpful vitamins and minerals.
Which of the following is an assumption on which this argument depends?
Smokers are less likely than nonsmokers to have diets that are rich in vitamins and minerals.
The lung function of smokers whose diets are rich in those vitamins and minerals is generally better than that of nonsmokers with comparable diets.
People whose diets are deficient in those vitamins and minerals do not typically have other health problems in addition to diminished lung function.
Stopping smoking will not typically improve lung function more than any diet changes can.
Smoking does not introduce into the body chemicals that prevent the helpful vitamins and minerals from entering the bloodstream.
A. 若A作为assumption成立，argument没必要推荐吸烟者补充营养食物。（吸烟者本身吃营养食物可能性就小）
E.吸烟不会阻止（吃进的）营养食物进入人体bloodstream。 （呼应第一句：bloodstream里营养level越高，lung function 就越好；吸烟的人想要好的lung function, 多补充营养）
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