单项选择题
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
A．research showed their health benefits B．people got the. message from magazine covers and postage stamps C．scientific evidence of health benefits was shown on TV ads D．an increasing number of races were held in American cities
A．a very great English novel B．an accurate portrayal of life in wartime C．an excellent piece of satire D．the work of a neglected author