Questions 11 to 18 are based on the conversation you have just heard.

A．Enhance the contests of force.
B．Change people’s old mental habits.
C．Change people’s ideologies.
D．Persuade mankind to live with war.

A．Africans are not very brave and resourceful.
B．There is no treatment or healthcare center at all.
C．There were no effective prevention systems.
D．There was no formal education in Africa at all.