单项选择题

When we hoist national flag together with other flags, we should keep the national flag in the （）place.

A.centre
B.lower
C.A+B
D.A o rB

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单项选择题

We can’t hoist （）national flag.

A.clean
B.worn
C.beautiful
D.good

单项选择题

The sailors should show the relevant （）by day.

A.ladders
B.flags
C.hands
D.lines