可申请参加船舶保安员培训的船员有（）。
A、船长
B、轮机长
C、值班水手
D、以上均可
参考答案：D
Where_______ your friend ________?
A．is; come from
B．do; come from
C．are; from
D．does; come from
The teacher asks them to look _____ the blackboard. [ ]
A. for
B. at
C. on
D. in
