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中国历史上虽曾出现过暂时的分裂现象，但民族团结和国家统一始终是中华民族历史的主流，也是中国发展进步的重要保障。[听力原文......

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A． They would help the crew to get out of the desert.B． They would help the crew to have radio contact.C． They would help people to identify them.D． They would help the engineers to know what had befallen them.
A． They would help the crew to get out of the desert.
B． They would help the crew to have radio contact.
C． They would help people to identify them.
D． They would help the engineers to know what had befallen them.
问答题
Stock exchanges serve important roles in national economies. They encourage investment by providing places for buyers and sellers to trade securities, stocks bonds, and other financial instruments. Companies issue stocks and bonds to obtain capital to expand their business.Corporations issue new securities in the primary market, usually with the help of investment bankers. In the primary market, corporations receive the proceeds of stock sales. Thereafter, they are not involved in the trading of stocks. Owners of stocks trade them on a stock exchange in the secondary market.In the secondary market, investors, not companies, earn the profits or bear the losses resulting from their trades. Stock exchanges encourage investment by providing this secondary market. By allowing investors to sell securities, exchanges increase the safety of investing.Stock exchanges also encourage investment in other ways. They protect investors by upholding rules and regulations that ensure buyers will be treated fairly and receive exactly what they pay for. Exchanges also support state-of-the-art technology and business of brokering, which both help traders to buy and sell securities quickly and efficiently.
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