单项选择题

A．It’s chancy.
B．It’s not a real job.
C．It’s easier than science.
D．It’s not as secure as science.
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单项选择题
A．allows fans to copy songs once or twiceB．allows consumers to burn the song to a CD three timesC．allows consumers to send the song to a portable device twiceD．is a compression format that turns music on compact discs into small computer files
A．allows fans to copy songs once or twice
B．allows consumers to burn the song to a CD three times
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
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