单项选择题
A container ship is one of the （）(干货) ships .
A. liquid cargo B. general cargo C. dry cargo D. bulk cargo
单项选择题 Some ships have（）(特殊职责) ,such as tugs.
单项选择题 （）（货船）can be divided into two basic types.
单项选择题 The most modern ship is（）（集装箱船）.
