As soon as he _____ the bus , the poor man realized he had left his wallet on it.
A:gets on
B:gets off
C:got on
D:got off
“现代文明的美国历史,是由一次伟大的、真正解放的、真正革命的战争开始的……”领导美国人民取得独立战争胜利的人物是( )
若函数fx=sinωx+cosωxω≠0对任意实数x都有fπ6+x=fπ6-x,则fπ3-πω的值等于( )