How many times did the box hit the man（）

单项选择题In the passage the two-way radio is（）

A．important to Americans
B．useful for children only
C．used as a telephone
D．only used by doctors

单项选择题What happened when the man let go the rope（）

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.