A.ReceiveB.ReceivingC.ReceivedD.receives（）persons who c……

单项选择题As a duty sailor, he should （）.

A. keep a gangway watch
B. often look around the ship
C. hoist and lower national flag on time
D. A+B+C

单项选择题The gangway is one meter higher,（） it, please.

A.lowing
B.lower
C.low
D.lowed

单项选择题The gangway is one meter lower, （）it please.

A.hinging
B.high
C.higher
D.highly

单项选择题（）the gangway, please.

A.Lower
B.Higher
C.Lowered
D.High

单项选择题（） you the officer on duty?

A.Is
B.Be
C.Are
D.Have