题目

As we all know, playing ________ chess is usually ________ one-to-one game. A . ／; a B . ／; an C . a; a D . the; a 答案：A下列是中国古代中央机构的示意图，其演化的先后顺序是A．①②③④B．①③④②C．①④②③D．②③④①