单项选择题
A.Before B.During C.After D.Within
Each （）consists of two or more panels.A.coverB.hatchC.d...
单项选择题Each （）consists of two or more panels.
A.cover B.hatch C.derrick D.winch
Keep a close watch on（） cargo.A.valueB.valuationC.valua...
单项选择题Keep a close watch on（） cargo.
A.value B.valuation C.valuable D.All above
（）on cargo lights.A.CloseB.SwitchC.OpenD.All above.
单项选择题（）on cargo lights.
A.Close B.Switch C.Open D.All above.
