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任何商品的替代效应总为负值。（）
房地产中介机构受委托代理销售商品房时，不得收取佣金以外的其他费用。（）
Passage One Thousands of years ago, in the middle of an ocean, miles from the nearest island, an undersea volcano broke out. The hot liquid got higher and higher and spread wider and wider. In this way, an island rose up in the sea. As time went on, hot sun and cool rains made the rock split and break to pieces. Sea waves hit against the rock. In this way, soil and sand came into being. Nothing lived on the naked soil. And then the wind and birds brought plant seeds, spiders and other little living things there. Only plants could grow first. Only they, in sunlight, could produce food from the soil, water and air. While many animals landed on the island, they could find no food. A spider made its web uselessly,because there were no insects( 昆虫) for its web to catch. Insects couldn’t stay until there were plants for them to eat. So plants had to be the first life on this new island. According to the passage, the island got its first soil from （）.
Passage Four Auctions( 拍卖) are public sales of goods, made by an officially approved auctioneer. He asked the crowd assembled in the auction room to make offers, or bids, for the various items on sale. He encouraged buyers to bid higher figures, and finally named 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 auction, meaning “increase”. The Romans usually sold in this way the spoils taken in war, these sales were called “sub hash”, meaning “under the spear”, a spear being stuck in the ground as a signal for a crowd to gather. In England in the eighteenth century, 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 varied are sold by auction. Among these are coffee, hides, skins, wool,tea, cocoa, furs, spices, fruit, 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 at 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 1 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. The end of the bidding is called “knocking down” because （） .
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