passage two Questions 29 to 31 are based on the passage you have just heard.

A．Bonks they had read.
B．Places they had been to.
C．Histories and things they remembered.
D．The fun they got from rending.

A．We can invent ways of increasing rainfall.
B．We can develop ways of reusing water and utilizing sea water,
C．We can cut down our consumption of water.
D．We can reduce the number of factories producing steel.