单项选择题
A．It is something people all engage in. B．It starts soon after we are born. C．It helps people acquire knowledge D．It is the source of all artistic work.
A．Transport problems B．Lack of resources. C．Shortage of funding. D．poor management.
A．Durable friendships can be very difficult to maintain B．One has to be respectful of other people in order to win respect. C．It is hard for people from different backgrounds to become friends D．Social divisions will break down if people get to know each other