单项选择题
When a ship arrives at a foreign port, you should hoist （）national flag.
A. foreign country’s B. own country’s C. A or B D. A+B
单项选择题 We should （）the national flag when the sun sets.
单项选择题 When you hoist national flag, you should hoist it in （）place.
单项选择题 A life-buoy should be （）at the gangway door.
