• 1. (2020高一上·上海期末) 表示图中坐标轴上阴影部分的表达式是（   ）

  

  A . (a<x<=b) and x>=c B . (x>a and x<=b) or x>=c C . (x>a and x<=b) and x>=c D . (a<x<=b) or x>=c