The mayor made a ______ speech at the opening ceremony of the sport meeting, which encouraged the sportsmen greatly.

A．Business management policies.
B．Needn't driving to work.
C．Extending the workplace by means of computers.
D．Computers for child-care purposes.

A．Small children can't understand the boundaries of work and play.
B．Computer technology is not advanced enough to meet the needs of every situation.
C．Technological troubles can destroy the program.
D．The worker often does not have all the needed resources at home.