prep1-14

newjoshkao

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?
            

注意到两者之间的GAP吗?

一个是
            V & M在血液中的量，另ㄧ个是
            V & M 在食物中的量。

 

含有丰富V & M食物的量增加，不见得代表V & M在血液中的量也会增加，

中间的前提必须是: 这些食物中的
            V&M 能顺利被吸收利用并进入血液。

 

答案A没有考虑到具体性和特殊性(in the bloodstream)。况且
        smoker也有可能原本就吃很多含有
        V&M的食物，但他们的肺还是较差，
            何来根据比较说smoker吃的V&M食物一定比nonsmoker少呢?