单选题A buoy，being a shape of cylinder and with red group flashing，shows that it is（）.Aleft-side buoyBright-side buoyCa buoy of safetyDa buoy of danger
单选题
A buoy，being a shape of cylinder and with red group flashing，shows that it is（）.
A
left-side buoy
B
right-side buoy
C
a buoy of safety
D
a buoy of danger
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