单项选择题
The ship should be operated by a company which is issue...
单项选择题The ship should be operated by a company which is issued a(an)（）relevant to ship.
A.ISM B.DOC C.SMC D.PSC
Christopher Columbus （） eighteen years （） planning for ...
单项选择题Christopher Columbus （） eighteen years （） planning for that wonderful voyage which he made across the Atlantic Ocean.
A.spends；in B.spent；on C.has spent；on D.had spent；in
Water can’t be used to put out fires of （）A.Class AB.Cl...
单项选择题Water can’t be used to put out fires of （）
A.Class A B.Class B C.Class C D.B+C
