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2、Security and commodity exchanges are meeting places for buyers and sellers of _____.

A.stocks

B.grain

C.securities

D.all of these

答案：D

解析：根据第二段和第三段，这一交易所可进行多种交易。

3、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

答案：A

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。

4、Security exchanges handle _____.

A.securities

B.grain

C.bonds

D.both A and C

答案：D

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.

5、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

答案：D

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。

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