单项选择题
There is a （）(灯塔).
A. lighthouse B. light buoy C. light castle D. lightship
单项选择题 （）(液体)cargo is carried by tankers.
单项选择题 （）(干散) cargo is carried by bulk carriers.
单项选择题 A lightship is like an/a（）(普通船舶).
