Poor　贫穷的Impoverished 17. Serious　严重的Severe 18. Obvious　明显的Manifest、Apparent、Evident 19. cheap　便宜的Economical、Inexpensive 20. Important重要的crucial 、extremely important、significant(amount or effect large enough to be important) 21. abundant　大量的、充足的ample、plentiful 22. near　附近、临近的adjacent、adjoin 六级典型词汇,