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單項選擇題

The air is （）(有毒的).

A.humid
B.damp
C.toxic
D.mould

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單項選擇題

Close all fire doors and use the （）（干粉滅火器）.

A. dry powder extinguisher
B. foam extinguisher
C. CO₂ extinguisher
D. portable extinguisher

單項選擇題

The signals that will be used for emergency should be clearly （）（列出）.

A. put out
B. set out
C. set on
D. put on

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