单项选择题

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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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．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.
填空题
joined：engaged or involved
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