B. It interrupted the business of the hotel.

　　C. It involved Pullman turning ten jackscrews.

　　D. It separated the building from its foundation.

　　25.The passage is mainly about the early Chicago's ______.

　　A. popular life styles and their influences

　　B. environmental disasters and their causes

　　C. engineering problems and their solutions

　　D. successful businessmen and their achievements

　　B

　　The oddness of life in space never quite goes away. Here are some examples.

　　First consider something as simple as sleep. Its position presents its own challenges. The main question is whether you want your arms inside or outside the sleeping bag. If you leave your arms out, they float free in zero gravity, often giving a sleeping astronaut the look of a funny balled （芭蕾）dancer. “I’m an inside guy,” Mike Hopkins says, who returned from a six-month tour on the International Space Station. “I like to be wrapped up.”

　　On the station, the ordinary becomes strange. The exercise bike for the American astronauts has no handlebars. It also has no seat. With no gravity, it’s just as easy to pedal violently. You can watch a movie while you pedal by floating a microcomputer anywhere you want. But station residents have to be careful about staying in one place too long. Without gravity to help circulate air, the carbon dioxide you exhale (呼气) has a tendency to form an invisible （隐形的）cloud around you head. You can end up with what astronauts call a carbon-dioxide headache.

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