Question

【题目】Protective clothing must be worn when the machine is in _________.

A. orderB. operation

C. lineD. public

Answer 1

【答案】B

【解析】

考查名词词义辨析。句意：在操作机器的时候必须要穿防护服。A. order命令，顺序；B. operation运行；C. line直线；D. public公共。本句为短语in operation运行之中，故选B。