单项选择题
A．for the highest price offered B．only at fixed prices C．at a price less than their true value D．very cheaply
A．he sometimes wants to confuse the buyers B．he knows from experience that certain people will want to buy certain items C．he wants to keep certain people waiting D．he wants to reduce the number
A．the auctioneer knocks the buyer down B．the auctioneer knocks the rostrum down C．the goods are knocked down on to the table D．the auctioneer bangs the table with a hammer