问题补充：
At a beach or a swimming pool a lifeguard is a person who is responsible for other swimmers and protecting them from accidents.
A. turning to
B. watching over
C. watching out
D. digging out
答案：
A. turning to
(答案→)B. watching over
C. watching out
D. digging out
解析：短语辨析。A. 转向 B.看守；照管C.小心；提防 D.掘出；发现。句意：在海边或者游泳池，救生员是一个负责照管他人，防止他们出现事故的一个人。故选B。
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