A．They should adapt to the need of the present society.
B．They should teach children to be aware of social problems.
C．They should be enjoyable and meaningful to the children.
D．They should be useful after children leave school.
A．The world is lack of consumption.
B．Food and resources are not enough.
C．Some countries want to have small population.
D．Haman activities have greater impact on the environment.
A．Consumption and impact on the environment.
B．Social stability.
C．Economic development.
D．Cultural prosperity.