An orange and white buoy marking a danger area will have what symbol on it?（）

An orange and white buoy indicating a vessel-exclusion area will be marked with what symbol? （）

A.Open-faced diamond
B.Diamond with a cross
C.Circle
D.Square

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A yellow buoy may mark a(n)（）.

A.wreck
B.shoal area
C.anchorage area
D.middle ground

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