Questions 22 to 25 are based on the conversation you have just heard.

A．International children’s projects.
B．Social and environmental projects.
C．Projects for people with no money.
D．Projects involving sports and languages.

A．The workers on the underground platforms were replaced by machines.
B．It became the first completely automatic railway in the world.
C．A completely automatic line was added to its network.
D．Its trains became computer-controlled.