阅读B：
　　Security and Commodity Exchanges
　　Security and commodity exchanges are trading posts where people meet who wish to buy or sell. The exchanged themselves do no trading; they merely provide a place prospective buyers and selling can meet and conduct their business.
　　Wall Street, although the best known, is not only the home of the exchanges in the United States. There are the cotton exchanges in New orleans and Chicago; and grain exchanges in many of the large cities of the Midwest. Some exchanges, like the Chicago Board of Trade, provide market services for several kinds of products. These trading posts where products may be bought or sole are called commodity exchanges.
　　The security exchanges, on the other hand, are meeting places where stocks and bonds are traded. Like the commodity exchanges, they help serve the economic life of the country. But when their operations get out of hand, they may become very dangerous. In 1929, the security exchanges, or stock market, contributed to a crash-a sudden, sharp decline in the value of securities. Many people lost fortunes; many corporations were bankrupted; many workers lost their jobs. The Crash of 1929 has been attributed to many causes, among them wild and unwise speculation by many people and dishonest practices on the part of some businessmen and of some members of the exchanges.
　　Today, however, investing through security exchanges and trading on commodity exchanges has been made safer by regulations set up by the exchanges themselves and by regulations of the United States government in 1992, the government instituted the Commodity Exchange Commission which operates through the Department of Agriculture; and in 1934, the Securities and Exchange Commission, to protect investors and the public against dishonest practice in the exchanges.
　　1、Security exchanges handle _____.
　　A. securities
　　B. grain
　　C. bonds
　　D. both A and C
　　参考答案：D
　　参考解析：根据第三段，债券交易所可以进行债券和证券的交易。The security exchanges, on the other hand, are meeting places where stocks and bonds are traded.
　　2、Security and commodity exchanges are meeting places for buyers and sellers of _____.
　　A. stocks
　　B. grain
　　C. securities
　　D. all of these
　　参考答案：D
　　参考解析：根据第二段和第三段，这一交易所可进行多种交易。
　　3、Which of the following is implied but not stated?
　　A. Some exchanges provide market services for several products.
　　B. The role of the government has been an important factor in curing dishonest practices on the exchanges.
　　C. Investing in securities is unwise.
　　D. Buying and selling is dishonest.
　　参考答案：B
　　参考解析：答案A在文章第二段直接提到了。Some exchanges, like the Chicago Board of Trade, provide market services for several kinds of products. 答案C证券投资是不明智的和答案D买卖双方是不诚实的，这两点在文中都没有提到。
　　4、Among the reasons for the Crash of 1929 were _____.
　　A. unwise speculation by many people
　　B. dishonest practices by some businessmen
　　C. strict regulations of the Commodity Exchange Commission
　　D. both A and B
　　参考答案：D
　　参考解析：根据第三段，The Crash of 1929 has been attributed to many causes, among them wild and unwise speculation by many people and dishonest practices on the part of some businessmen and of some members of the exchanges. 1929年的股市危机是由于许多人投机和一些商人不诚实的行为造成的。
　　5、Investing in securities has been made safer by the _____.
　　A. Security and Exchange Commission
　　B. Commodity Exchange Commission
　　C. Chicago Board of Trade
　　D. Chicago Mercantile Exchange
　　参考答案：A
　　参考解析：最后一段，and in 1934, the Securities and Exchange Commission, to protect investors and the public against dishonest practice in the exchanges.政府建立的证券交易委员会使投资变得更加安全。
　　参考译文：
　　证券和商品交易所
　　证券交易所和商品交易所是人们见面的交易场所。交换者本身不做交易；他们只是提供一个潜在买家的地方，出售可以满足并开展他们的业务。
　　华尔街虽然是最着名的，但它不仅是美国交易所的所在地。新奥尔良和芝加哥有棉花交易所，中西部许多大城市也有谷物交易所。一些交易所，如芝加哥贸易委员会，为多种产品提供市场服务。这些可以购买或出售产品的交易站被称为商品交易所。
　　另一方面，证券交易所是股票和债券交易的场所。像商品交易所一样，它们帮助服务于国家的经济生活。但一旦他们的行动失控，他们可能会变得非常危险。1929年，证券交易所或股票市场导致了一场崩溃——证券价值的突然急剧下降。许多人失去了财富；许多公司破产；许多工人失业。1929年的金融危机有许多原因，其中包括许多人的疯狂和不明智的投机行为，以及一些商人和一些交易所会员的不诚实行为。
　　然而，如今，通过证券交易所进行投资和在商品交易所进行交易，已经通过交易所本身制定的法规和1992年美国政府的法规，使之更加安全，政府设立了商品交易委员会，该委员会通过农业部运作；1934年证券交易委员会，保护投资者和公众在交易所不受不诚实行为的侵害。