单项选择题
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
A．Once B．Three times C．Twice D．Four times
A．The box fell down and hit the man on the head. B．The box continued to go up. C．The man went up to the top of the building. D．The man fell down and broke his legs.