题目

George Gershwin, born in 1998, was one of America’s greatest composers. He published his first song when he was eighteen years old. During the next twenty years he wrote more than five hundred songs. Many of Gershwin’s songs were first written for musical plays performed in theatres in New York City. These plays were a popular form of entertainment in the 1920s and 1930s. Many of his songs have remained popular as ever. Over the years they have been sung and played in every possible way — from jazz to country. 61. Many of Gershwin’s musical works were ________ .  A. performed用科学记数法表示13050000，应记作 ．