单项选择题
A．respond to the owners" order B．respond to a sound device C．act on the owners" instructions D．act on the trainers" order
A．people who attend their concerts need them B．they want to make extra money C．there are still people who prefer CDs to other formats D．people who fail to attend their concerts need them
A．people spend a lot of time preparing a gift B．people would cash out the gift immediately C．people are eager to get a gift from a friend D．people are less willing to give gifts