题目

汽车经过启动、加速行驶、匀速行驶、减速行驶之后停车，若把这一过程中汽车的行驶 路程s看作时间t的函数，其图象可能是________． 答案：①   She waved to the visitors while she was dancing __________ the music. She danced so __________.     A. in , beautiful                    B. of , wonderfully     C. at , wonderful                  D. to , beautifully