单选题 Auctions are public sales of goods, conducted by an officially approved auctioneer. He asks the crowd assembled in the auction-room to make offers, or "bids", for the various items on sale. He encourages buyers to bid higher figures and finally names the highest bidder as the buyer of the goods. This is called "knocking down" the goods, for the bidding ends when the auctioneer bangs a small hammer on a table at which he stands. This is often set on a raised platform called a rostrum.
The ancient Romans probably invented sales by auction, and the English word comes from the Latin Autcio, meaning "increase". The Romans usually sold in this way the spoils taken in war; these sales were called sub hasta, meaning "under the spear", a spear being stuck in the ground as a signal for a crowd to gather. In England in the eighteenth and nineteenth centuries, goods were often sold "by the candle": a short candle was lit by the auctioneer, and bids could be made while it stayed alight.
Practically all goods whose qualities vary are sold by auction. Among these are coffee, hides, skins, wool, tea, cocoa, furs, spices, fruit and vegetables and wines. Auction sales are also usual for land and property, antique furniture, pictures, rare books, old china and similar works of art. The auction-rooms as Christie's and Sotheby's in London and New York are world-famous.
An auction is usually advertised beforehand with full particulars of the articles to be sold and where and when they can be viewed by prospective buyers. If the advertisement cannot give full details, catalogues are printed, and each group of goods to be sold together, called a "lot", is usually given a number. The auctioneer need not begin with Lot I and continue in numerical order; he may wait until he registers the fact that certain dealers are in the room and then produce the lots they are likely to be interested in. The auctioneer's services are paid for in the form of a percentage of the price the goods are sold for. The auctioneer therefore has a direct interest in pushing up the bidding as high as possible.

单选题 Why is the end of the bidding called "knocking down"?
A. Because the auctioneer knocks the buyer down.
B. Because the auctioneers knocks the rostrum down.
C. Because the goods are knocked down on to the table.
D. Because the auctioneer bangs the table with a hammer.

单选题 The Roman used to sell by auction______
A. spoilt goods B. old worn-out weapons
C. property taken from the enemy D. spears

单选题 A candle used to burn at auction sales______
A. because they took place at night
B. as a signal for the crowd to gather
C. to keep the auctioneer warm
D. to limit the time when offers could be made

单选题 The auctioneer may decide to sell the "lots" out of the order because ______
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 of buyers