"The role of a zoo designer is to think as much as possible about what will make each animal comfortable, happy, and active," says Ehmke, director of the Minnesota Zoo in Apple Valley.

　　"It would be wrong to say you can know what an animal is thinking and feeling," he adds. "But we do our best to get as close to that as possible when we're designing homes for them."

　　Most zoo visitors focus on the animals, not on the habitats and barriers that fence the animals in. But details like these have received extra attention since December, when a female Siberian tiger escaped her enclosure (围栏) at the San Francisco Zoo. The 4-year-old, 350-pound cat killed one person and injured two others.

　　The incident raised fears among zoo goers and sent staff at zoos across the nation rushing to evaluate how safe their own exhibits are. Still, experts say, the tragic event should not scare people away from zoos.

　　"There have probably been 5 billion visits to zoos in the last 50 years," Ehmke says. "This is the first time this has happened."

　　57. What is Lee Ehmke?

　　A. An official

　　B. A professor

　　C. A designer

　　D. A feeder

　　58. What does the underlined expression “Lee Ehmke's customers” refer to?

　　A. Architects

　　B. Animals

　　C. Bathrooms

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