When he ___ the bus , the poor man realized he had left his bag on it.
A:got on
B:got off
C:got to
D:got up
我国对外开放的五个经济特区中最大的是( )
下列成语用来描述声音响度很大的是( )
sin37°=0.6,cos37°=0.8 )求: