[背景了解]
　　文章取自于2003年9月的閱讀真題，是關于維生素的文章，選段很短，希望耐心看下，自己先猜下劃線部分單詞的意思吧
　　[文章部分]
　　Multivitamins are no substitute for exercise and a balanced diet, of course. As long as you understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense.
　　[單詞學習]
　　Multivitamin adj.多種維生素的n.多種維生素劑 ( multi- 前綴表示"種種","多","多方面的"）
　　substitute n.代用品, 代替者, 替代品v.代替, 替換, 替代
　　potential adj.潛在的, 可能的, 勢的, 位的
　　modest adj.謙虛的, 謙讓的, 適度的
　　refinement n.精致, (言談, 舉止等的)文雅, 精巧
　　[課后作業]
　　今天的作業就是翻譯下面幾個句子,來試下吧
　　1.He substitutes as our teacher of English.
　　2.Careful analysis of the data can reveal some potential problems..
　　3.He's got a drawer full of medals but he's too modest to wear them.
　　4.Gasoline is produced by the refinement of petroleum.
　　5.As long as you understand that any potential benefit is modest and subject to further refinement, taking a daily multivitamin makes a lot of sense.
　　答案：1.他代任我們的英語教師。
　　2.對數據仔細的分析能夠揭示一些潛在的問題。
　　3.他有滿滿一抽屜的獎章,但是他很謙虛,從不戴它們。
　　4.汽油是由石油經過提煉生產出來的。
　　5.只要你明白任何潛在的益處都需適度，并且需要逐步得到發揮，那么，每天服用多種維生素就會有意義。