单项选择题
A．He is interested in science. B．He changes his mind easily. C．He is not good at painting at all. D．He doesn’t worry about the security of a profession the way his father did
A．allows fans to copy songs once or twice B．allows consumers to burn the song to a CD three limes C．allows consumers to send the song to a portable device twice D．is a compression format that turns music on compact discs into small computer files