American boys and girls like watching TV. Some children spend six hours a day at school and four to six hours a day in front of the TV sets. Some children even watch TV for eight hours or more on Saturday.
   Television（电视）is like books and films . A child can learn good things and bad things from it. Some TV programs help children to understand the news, the people and places from other countries. With TV, children do not have to go out to see films, they can hear interesting music or watch a game at home. But some programs are bad for children, so parents sometimes help them to find other interesting and useful things to do.

①糖类②脂肪③蛋白质④水⑤无机盐⑥维生素

如图所示，用硬纸片把收音机的一个喇叭糊起来，做成一个“舞台”，当你打开收音机时台上一个小人在音乐声中翩翩起舞．关于这个现象，下列说法中不正确的是（　　）