30. Although all sedimentary rocks contain iron, but the deposits that are richest in iron consist predominantly of minerals such as iron oxides, carbonates, silicates, and sulfides.
30. Of all the art-related reference and research library in North America, that of the laceName w:st="on">MetropolitanlaceName> laceType w:st="on">MuseumlaceType> of a Art in New York City is among the largest and most complete.
這題the largest and (the ) most complete 後面就沒有接名詞,也對阿...