單項選擇題

You will extinguish a fire when you remove（）.

A.nitrogen
B.oxygen
C.sodium
D.carbon dioxide

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單項選擇題

You’d better（）your course to port to avoid collision.

A.to alter
B.alter
C.altering
D.altered

單項選擇題

Your fireman’s outfit includes a(n)（）.

A.chemical protection face shield
B.approved work vest
C.self-contained breathing apparatus
D.marlinspike

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