What is the lifesaving signal for，You are seen - assistance will be given as soon as possible?（）<br>A:Green star rocket<br>B:Red star rocket<br>C:Orange smoke signal<br>D:Horizontal motion of a flag

What is the lifesaving signal for，You are seen - assistance will be given as soon as possible?（）
A:Green star rocket
B:Red star rocket
C:Orange smoke signal
D:Horizontal motion of a flag

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