[A] exact [C] certain
[B] definite [D] decisive

A．Musical instruments developed through the years will sooner or later be replaced by computers.
B．Music cannot be passed on to future generations unless it is recorded.
C．Folk songs cannot be spread far unless they are printed on music sheets.
D．The development of music culture is highly dependent on its material aspect.

A．has brought about an information revolution
B．has speeded up the appearance of a new generation of computers
C．has given rise to new forms of music culture
D．has led to the transformation of traditional musical instruments