STM－N帧中单独一个字节的比特传输速率是（)

STM-N帧中单独一个字节的比特传输速率是()

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C波段的波长范围为() 。

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Rock and roll began in the 1950s in the USA. Rock and roll was based on African American styles of music －jazz, blues, rhythm and blues, and gospel and mixed with the sound of country. Elvis Presley w

Rock and roll began in the 1950s in the USA. Rock and roll was based on African American styles of music -jazz, blues, rhythm and blues, and gospel and mixed with the sound of country. Elvis Presley was one of the first big stars of rock and roll. He was considered the "King" of rock and roll. Famous rock and roll stars and groups include Bill Haley and his group, the Comets, "Girl groups", the Ronettes (whose biggest hit was "Be My Baby"), the Crystals (whose biggest hit was "Da Doo Ron Ron" ), and the ShangriLas ( whose biggest hit was "Leader of the Pack" ) etc.

At the same time, in England, a group that became known as the Beatles was forming. Another British group formed at about the same time was the Rolling Stones. Their best-known members are Mick Jagger and Keith Richards. A record company called Motown ( eventually the name of the African American style, too), located in Detroit, Michigan, began producing hit records by African American groups and solo artists. Some of their most famous artists were Stevie Wonder,

The Temptations, Diana Ross and the Supremes, Gladys Knight and the Pips, and the Jackson

Five. Michael Jackson, the youngest of the Jackson Five, went on to become a world-famous solo artist. Since the 1960s, there have been many different styles of rock music punk rock, heavy metal, and hip-hop, just to name a few. By the end of the twentieth century, rock music was known almost everywhere in the world.

41. This text mainly introduces to us()

A.some of the famous pop stars in the modem world

B. different styles of pop music

C. a simple history of the popular music ----rock and roll.

D. some of the countries known as the sources of pop music

42. The music performed by the Rolling Stones was based on()

A. British styles

B. American styles

C. African styles

D. African American styles

43. Which of the following is NOT true?

A. Elvis Presley can remind people of rock and roll.