Questions 19 to 21 are based on the conversation you have just heard.

A．Part of the events occurring on the university campus at Berkeley were given national media coverage.
B．The 1989 San Francisco earthquake hasn’t been covered by the video programme.
C．Electronic media can limit one’s contact with the world.
D．Those living far away from a certain event can not have perception of realities.

A．In science .it is not difficult to distinguish fact from fiction.
B．Practical-minded people can understand the meaning and objectives of pure science.
C．Scientists engaged in the theoretical research should not be blamed for ignoring the practical side of their discoveries.
D．Today few people have any notion of the meaning of science.