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

A. orderB. operation

C. lineD. public

【答案】B

【解析】

考查名詞詞義辨析。句意：在操作機器的時候必須要穿防護服。A. order命令，順序；B. operation運行；C. line直線；D. public公共。本句為短語in operation運行之中，故選B。

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