Pullman's signal each man turned his jackscrew the same amount at the same time, thereby raising the building slowly and evenly. Astonishingly, the Tremont Hotel stay open during the entire operation, and many of its guests didn't even notice anything was happening. Some people like to say that every problem has a solution. But in Chicago's early history, every engineering solution seemed to create a new problem.

　　Now that Chicago's waste water was draining efficiently into the Chicago River, the city's next step was to clean the polluted river.

　　21.The author mentions the joke to show ______.

　　A. horses were fairly useful in Chicago

　　B. Chicago's streets were extremely muddy

　　C. Chicago was very dangerous in the spring

　　D. the Chicago people were particularly humorous

　　22.The city planners were convinced by Ellis Chesbrough to_______.

　　A. get rid of the street dirt

　　B. lower the Chicago River

　　C. fight against heavy floods

　　D. build the pipes above ground

　　23.The underlined word "hoist" in Paragraph 4 means "_______".

　　A. change

　　B. lift

　　C. repair

　　D. decorate

　　24.What can we conclude about the moving operation of the Tremont Hotel?

　　A. It went on smoothly as intended.

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