單項(xiàng)選擇題

The tide（）.It’s 2 hours before low water, and（）your present position you will be aground at low water.

A.falls/in
B.has been falling/on
C.has fallen/at
D.is falling/in

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單項(xiàng)選擇題

The type of extinguisher which should be used for an electricity fire is（）.

A.foam or soda acid
B.dry chemical or foam
C.carbon dioxide or dry chemical
D.carbon dioxide or foam

單項(xiàng)選擇題

The vessel on opposite course will（）on your port side.

A.pass
B.overtake
C.catch up
D.run down