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單項(xiàng)選擇題

The air is （）. Don’t enter that area.

A.fresh
B.toxic
C.poison

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單項(xiàng)選擇題

Post two lookouts with （）.

A.sextant
B.compass
C.radar
D.binoculars

單項(xiàng)選擇題

Fire in the cabins. Close all fire doors and use the （）powder extinguisher.

A.dry
B.wet
C.foam
D.portable