题目

The _______ income of the common people has been greatly increased in the past thirty years ______ the reform and opening-up policy in China. A. regular; because                           B. usual; thanks to     C. normal; on an account of                   D. annual; owing to 答案：D下列文字或字体演变的先后顺序是①竹帛书②大篆③金文④甲骨文 [     ]A．①②③④B．②③①④C．①③②④D．④③②①