单项选择题A．To let them learn some financial experiences.B．To let them learn how to save money.C．To let them learn how to buy gifts.D．To let them learn how to earn money.

单项选择题A．It takes some materials out of garbage.B．It separates garbage into useful and useless things.C．It just drops the garbage onto a conveyor belt that feeds the machine.D．It pumps water into garbage.