Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning.

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问题 Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning.

选项 A、observed
B、preserved
C、monitored
D、nurtured

答案C

解析 本题中,supervised的意思是“监督,管理,指导”。四个选项中,monitored的意思是“监控”,如:a television wave form monitor(电视波形监视器)。observed的意思是“观察,遵守”;preserved的意思是“保护,保持”;nurtured的意思是“养育,教养”。只有C符合题意。
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