单项选择题
A．nobody takes any notice of you B．the assistant greets you in a friendly way C．you can always obtain the books you need D．you feel that you are in a music shop
A．the books are very attractive B．you have started reading an interesting book C．it is raining outside D．you have to make sure you don't buy a dull book as a present
A．to prevent anyone from buying it B．because the medical student might take it away C．in case the medical student was tempted to buy it D．because the medical student was tempted to buy it