单项选择题

You will extinguish a fire when you remove （）.

A.oxygen
B.carbon dioxide
C.H₂O
D.H₂

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单项选择题

I’m on fire and have dangerous cargo on board. The most urgent assistance (最紧急的援助)in this case would be（） .

A.lifeboat
B.medicine
C.firefighting
D.lifesaving

单项选择题

（）(停顿) for a while when the boat leaves the surface.

A.Halting
B.Halt
C.Adjust
D.Heave

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