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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1.單項選擇題You’d better（）your course to port to avoid collision.
A.to alter
B.alter
C.altering
D.altered
2.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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