30年代（）的救亡歌曲《毕业歌》《义勇军进行曲》占有突出地位.
参考答案：聂耳
— You are supposed _____ at 6:30. Why are you so late?
— I am sorry. [ ]
A. in arriving
B. to arrive
C. to get to
产品产量增长5%，单位成本减少5%，则总成本（）
A、下降0.25%
B、上升5%
C、下降5%
D、上升0.25%
