【单项选择题】
抛救生圈()
A、A. release a lifebuoy
B、B. release a life-jacket
C、C. release a lifeboat
D、D. release a life-raft
A、A. release a lifebuoy
B、B. release a life-jacket
C、C. release a lifeboat
D、D. release a life-raft