看下面的一道试题：
Many breakfast cereals are fortified with vitamin supplements. Some of these cereals provide 100 percent of the recommended daily requirement of vitamins. Nevertheless ,a well-balanced breakfast, including a variety of foods, is a better source of those vitamins than are such fortified breakfast cereals alone.
Which of the following ,if true ,would most strongly support the position abovel .
A) In many foods, the natural combination of vitamins with other nutrients makes those vitamins more usable by the body than the vitamins added in vitamins supplements.
B) People who regularly eat cereals fortified with vitamin supplements sometimes neglect to eat the foods in which the vitamins occur naturally.
C) Foods often must be fortified with vitamin supplements because naturally occurring vitamins are removed during processing.
D) Unprocessed cereals are naturally high in several of the vitamins that are usually added to fortified breakfast cereals.
E) Cereals containing vitamin supplements are no harder to digest than similar cereals without added vitamins.
这一段的意思是：一些营养麦片早餐都含有维生素，可以提供身体所需要的维生素。但是，为保持身体所需要的维生素，吃营养均衡、品种丰富的早餐(以下简称早餐)要比只吃这样的麦片好。
要求在五个选项中找出支持作者的选项，证明麦片确实在为人体提供维生素方面不如早餐好。我们要牢牢记住，正确的选项一定是说麦片不如早餐好的。
A说早餐的维生素比麦片里的维生素更容易被人体吸收，这就部分支持了作者，说明还是吃早餐好，正确。
B说的是饮食习惯问题，吃麦片不吃自然食物，只能说明饮食习惯不好，不能证明麦片和早餐在为人体提供维生素方面哪个更好。
C是事实，但不能支持作者，因为没有触及核心问题，即麦片和早餐哪个更好。
D走题了。说的是未经处理的麦片的问题，这里谈论的是添加了维生素并经过处理的麦片，当然，D也没有提出麦片和早餐哪个更好。
E部分反驳了作者的论点。E的意思是带有维生素的麦片和普通麦片一样容易被人消化，这事实上是在说麦片的好处，而作者是说麦片不好，所以E起到的是削弱结论的作用
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