题目

广播电台或广播电视台的发射天线的作用是（） A . 只发射音频电流激发的电磁波 B . 只发射视频电流激发的电磁波 C . 只把音频电流和视频电流加载到更高频率的射频电流上，再通过天线发射 D . 三种电流不经调制通过天线发射三种不同的电磁波 答案：C1.Two years later, Hepburn was chosen to play the role of a young princess in the Hollywood film Roman Holiday. _________________________________________________________________2.During her lifetime, Hepburn had four more Oscar nominations. _________________________________________________________________3.In 1989，Hepburn made her final appearance in the film Always and played the role of an angel. _________________________________________________________________4.Hepburn’s achievements went beyond the film industry. _________________________________________________________________5.She began to work for UNICEF in the 1950s. _________________________________________________________________