Unit 3. What’s Your Knowledge? » Стр.68 (15)

Complete the text about the compact disc by using the present simple passive or the past simple passive of the verbs in brackets and answer the following questions: THE COMPACT DISC A compact disc, or CD, is a disc on which signals (1) are recorded (record).The signals can be sounds, such as music, video picture signals or information for computers. It (2) is made (make) of aluminium, which is covered (cover) with a layer of clear plastic. The signal (4) are cut (cut) into the surface and (5) are read (read) by a laser. The compact disk (6) was invented (invent) in 1965 by James Russell, but it became popular when it (7) was intraduced at first (introduce) in 1980 and massproduced by the Japanese company Sony and the Dutch company Philips. It all started in the year 1979, when Philips and Sony got together to design a new digital audio disc. This disc (8) was sold soon (sell) all over the world, especially Europe and the United States in 1985, and the rest is history. Today it (9) is used (use) for storing high quality recorded sound and large quantities of information. And, thank god, it (10) is sold (sell) at a very low price!