单项选择题
A.controlled B.controller C.control D.controllable
The air is （）. Don’t enter that area.A.freshB.toxicC.po...
单项选择题The air is （）. Don’t enter that area.
A.fresh B.toxic C.poison
Post two lookouts with （）.A.sextantB.compassC.radarD.bi...
单项选择题Post two lookouts with （）.
A.sextant B.compass C.radar D.binoculars
Fire in the cabins. Close all fire doors and use the （）...
单项选择题Fire in the cabins. Close all fire doors and use the （）powder extinguisher.
A.dry B.wet C.foam D.portable
