单项选择题

A．At an emergency center.
B．At a bus stop.
C．At a railway station.
D．At an airport.
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单项选择题
A．The world’ s largest electronic stock market, Nasdaq.B．The competition between Nasdaq Stock Market and New York Stock Exchange.C．The development of the world’ s stock market.D．The history of the world’ s electronic stock trading system.
A．The world’ s largest electronic stock market, Nasdaq.
B．The competition between Nasdaq Stock Market and New York Stock Exchange.
C．The development of the world’ s stock market.
D．The history of the world’ s electronic stock trading system.
填空题
The filter of the purifier is put in a larger container because communities can make money by producing and selling the containers.
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