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單項(xiàng)選擇題

What is the BEST conductor of electricity?（）

A.Carbon dioxide
B.Distilled water
C.Fresh water
D.Salt water

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單項(xiàng)選擇題

Upon completion of fueling a gasoline driven vessel it is necessary to（）.

A.keep ports，doors，windows，and hatches closed
B.start engines immediately
C.ventilate before starting engine
D.None of the above

單項(xiàng)選擇題

There are（）rats on board.

A.not
B.no
C.any
D.none

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