单项选择题
Ropes should be kept （）.
A. in wet places B. close to the heat C. away from chemicals D. in dry places
单项选择题 It is more economical to use （）, because of their greater strength and longer useful lives.正确答案A
单项选择题 Natural fiber rope is made （）the fibers of different plants.
单项选择题 Wire rope needs （）care than hemp and manila.
