作者：英吉
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?
(A) Smokers are less likely than nonsmokers to have diets that are rich in vitamins and minerals.
(B) The lung function of smokers whose diets are rich in those vitamins and minerals is generally better than that of nonsmokers with comparable diets.
(C) People whose diets are deficient in those vitamins and minerals do not typically have other health problems in addition to diminished lung function.
(D) Stopping smoking will not typically improve lung function more than any diet changes can.
(E) Smoking does not introduce into the body chemicals that prevent the helpful vitamins and minerals from entering the bloodstream.
问题分析：A说抽烟的比不抽烟的吃富含维他命和矿物质的食物可能性低，这个选项显然于原文最后所说反了，但是我问的是假设，正确答案应该是支持而不是相反，杀。
B 说吃相同食物的抽烟者比不抽烟者肺部功能要好，没说，杀。
C 说是否会得其他疾病，范围不对，杀。
D 说戒烟会比饮食的改变更管用，显然没提过，杀。
E 说是否有一些物质能阻止这些维他命和矿物质进入血管（原文的前提就是这些物质的进入血管，这个选项无非就是说原文的前提成立。）
