单项选择题
A.the box of bricks B.the ladder C.the top of the buliding D.the pulley
A.He was afraid that someone would steal his box. B.Because he wanted to climb up along the rope. C.He fastened the end of the rope in order to keep the box unmoved. D.Because he wanted to prevent the box from coming down.
A.the box of bricks was heavier than him B.the box of bricks was lighter than him C.the box of bricks came down too fast D.the man was too careless