Questions 19 to 22 are based on the conversation you have just heard.

A．Because of the application of new technology and methods.
B．Because of farmer’s intelligence and luck.
C．Because of the increase in agriculture export.
D．Because of the increase in agriculture import.

A．To reduce half of the number of people who lack safe drinking water by 2015.
B．To arouse political desire to meet future water demands.
C．To release a report on water development and water problems in the world.
D．To maintain sustainable development of South Africa till 2015.