Passage One Questions 11 to 13 are based on the passage you have just heard.

A．Environmental balance will be achieved easily.
B．Less land will be used for agriculture.
C．New environmental problems will have to be dealt with.
D．World population will be reduced.

A．To master basic reading skills.
B．To learn how to deal with tests.
C．To read well in order to pass tests.
D．To master all kinds of skills.