发芽的土豆只要不吃芽，其余的部分照样能吃______．
马铃薯中含有龙葵素，它是一种对人体有害的生物碱，平时马铃薯中含量极微，一旦马铃薯发芽，芽眼、芽根及其周围会变绿，这些地方含很多龙葵素，溃烂的地方龙葵素的含量急剧增高，可高出平时含量的40～70倍，人吃了这种马铃薯，轻者恶心呕吐，腹痛，腹泻，重者可出现脱水，血压下降，呼吸困难，昏迷，抽搐等现象．严重者还可因心肺麻痹而死亡．因此吃发芽的马铃薯会中毒．据此可知，发芽的土豆的芽、芽根及其周围、以及溃烂的部分都不能吃．
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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 good. This is called "knocking down" the goods, for the bidding ends when the auctioneer strikes a small hammer on a table at which he stands. 2._____ The ancient Roman probably invented sales by auction, and the English word comes from the Latin auction, meaning "increase". The Romans usually sold in this way the goods taken in war. 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. 3._____ Practically all goods whose qualities vary are sold by auction. Among these are coffee skins, wool, tea, furs, silk and wines. Auction sales are also usual for land and property. Furniture pictures, rare books, old china and similar works of art. 4. _____ An auction is usually advertised beforehand with full particulars often articles to be sold and where and when they can be viewed by potential 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 the order of numbers, he may wait until he notices the fact that certain buyers are in the room and then produce the lots they are likely to be interested in. 5._____ 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. He will not waste time by starting the bidding too low. He will also play on the opponents among his buyers and succeed in getting a high price by encouraging two business competitors to bid against each other. |