单项选择题
（）are used to secure the two containers, one on top of the other.
A. Turnbuckles B. Lashing bars C. Twist locks D. Lashing wires
单项选择题 （）are used to secure the second and the third tiers of containers.
单项选择题 Get ready for （）the cargo on deck.
单项选择题 We’ll finish （）cargo before long.
