That's where George Pullman came in. He had developed some house­moving skills successfully. To lift a big structure like the Tremont Hotel, Pullman would place thousands of jackscrews (螺旋千斤顶) beneath the building's foundation. One man was assigned to operate each section of roughly 10 jackscrews. At 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 stayed 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.

　　语篇解读　芝加哥早期城市规划不合理，一遇洪灾路面就会十分泥泞，后来在工程师Ellis Chesbrough和George Pullman的努力下，成功将城市路面以及建筑物提高，避免路面受洪灾影响，但这又导致了另外一个问题的出现。

　　1．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

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