单项选择题
When you hoist national flag, you should hoist it（）.
A.quickly B.rapidly C.slowly D.speedily
单项选择题 After a ship leaves a foreign port, you should （）that country’s national flag.
单项选择题 When a ship arrives at a foreign port, you should hoist （）national flag.
单项选择题 We should （）the national flag when the sun sets.
