单项选择题
Some ships have（）(特殊职责) ,such as tugs.
A. duty
B. special duties
C. special duty
D. special
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（）（货船）can be divided into two basic types.
A. Cargo ships
B. Oil ships
C. Gas carriers
D. Tramps -
单项选择题
The most modern ship is（）（集装箱船）.
A. dry cargo ship
B. container ship
C. liquid cargo ship
D. refrigerated ship -
单项选择题
A few ships carry（）（旅客）.
A.lightship
B.passengers
C.ferry
D.cadet
