The constitution’s ______ nature has given it flexibility to be

The constitution’s ______ nature has given it flexibility to be adapted when circumstances change.
A、unpolished
B、concise
C、elementary
D、vague
【正确答案】：D
【题目解析】：unpolished 无光泽的；concise 简明的；elementary 基本的；vague 模糊的。句意： 宪法的模糊性赋予了它适应环境变化的灵活性。D符合题意