职教组卷基于海量职教高考试题库建立的在线组卷及学习系统
职教组卷
  • 题型:选择题 题类:历年真题 难易度:中档

    (2015•山东) Everybody should do something to save water, for it is        in the world.
    A. useless B. limited C. rich D convenient