单项选择题
A.officers B.crew members C.sailors D.motorman
When a ship is in port, the sailor on duty （）a gangway ...
单项选择题When a ship is in port, the sailor on duty （）a gangway watch.
A.has B.keeps C.looks D.takes
Hang national flag upside down should be strictly （）.A....
单项选择题Hang national flag upside down should be strictly （）.
A.prohibit B.prohibited C.prohibiting D.prohibits
When you hoist national flag, you should hoist it（）.A.q...
单项选择题When you hoist national flag, you should hoist it（）.
A.quickly B.rapidly C.slowly D.speedily
