题目

填空题。1. There ______ a teachers’ office. 2. There ______ many classrooms. 3. There ______ an art room. 4. How many music rooms ______ there? 5. There ______ teachers’ rooms. 答案：【答案】1. is 2. are 3. is 4. are 5. are 【解析】略已知直角坐标系内有四个点A(-1，2)，B(3，0)，C(1，4)，D(x,y)，若以A，B，C，D为顶点的四边形是平行四边形，则D点的坐标为___________________.