单项选择题
Manila is a well-known （）rope.
A. natural fiber B. synthetic fiber C. moor D. manila
单项选择题 Ropes can be divided into three types: （）.
单项选择题 Ropes can be divided into （）basic types.
单项选择题 It is very important for every sailor （）the characteristics of the ropes so that they can be for right jobs.
