第31题: [单项选择]The Constitution's {{U}}vague{{/U}} nature has given it the flexibility to be adapted when circumstances change. A. imprecise B. concise C. unpolished D. elementary 参考答案:A 答案解析:[解析] 本句意思:宪法的模糊性赋予它灵活性,以适应环境变化。vague:模糊的。而备选[答案] imprecise=im+precise(准确的)。例如:Imprecise calculation