All of the technological advances that have increased the quality of music have not change

d the fundamental impact of recorded music. Electronic engineering furnishes products which are replaced so【C1】______. It is easy to forget the importance they held at the time of their【C2】______. Before the advent of digital equipment, there were a whole【C3】______ of mechanisms designed to record sound, from the original hand-cranked gramophones,【C4】______ the electric phonographs, the stereo record albums, to the cassette tapes. There are two【C5】______ for these developments: the precision of recording, and the【C6】______ of the equipment. Digital sound engineering is the【C7】______ of industrial efforts. It can【C8】______ the musical sources to the minutest detail and【C9】______ reproduced sounds through portable players. 【C10】______ the continuous wave of new sound facilities, entertainment has changed its form. Before the introduction of mechanical reproduction, it【C11】______ almost impossible to【C12】______ having an entire symphony, performed in a court setting, within a house of small size.【C13】______ classical music, a single household can host a dozen different bands of【C14】______ styles. The delivery of music through the electronic medium now claims high【C15】______ and encourages the prospect of creating a(n)【C16】______ reality. The boundary between reality and representation thus【C17】______ its clear-cut definition; listeners have great difficulty in deciding which is【C18】______, the live source, or the reproduced acoustics. 【C19】______ the distinction between fiction and reality is becoming more and more【C20】______, lifelikeness remains the principle criterion in measuring the effectiveness of sound since the invention of the gramophone.

【C1】

A．quickly

B．gradually

C．slowly

D．abruptly