It can be inferred from the passage that ______.

单项选择题Which of the following statements best explains wireless holds the key

单项选择题According to the passage, music industry should ______.

单项选择题It is suggested that to make fans willing to pay for the music they get from the internet, the music companies and the related industry should do the following EXCEPT ______.

单项选择题______ has tried such an approach as everywhere Internet audio .