16、回答16-22题

Wide World of Robots

　　Engineers who build and program robots have fascinating jobs. These researchers tinker(修补) with machines in the lab and write computer software to control these devices. Theyrethe best toys out there, says Howie Choset at Carnegie Mellon University in Pittsburgh. Chose!is a roboticist, a person who designs, builds or programs robots.

　　When Choset was a kid, he was interested in anything that moved cars, trains, animals.He put motors on Tinkertoy cars to make them move. Later, in high school, he built mobilerobots similar to small cars.

　　Hoping to continue working on robots, he studied computer science in college. But whenhe got to graduate school at the California Institute of Technology in Pasadena, Chosetslabmates were working on something even cooler than remotely controlled cars: robotic snakes.Some robots can move only forward, backward, left and fight. But snakes can twist (扭曲) inmany directions and travel over a lot of different types of terrain (地形). Snakes are far moreinteresting than the cars, Choset concluded.

　　After he started working at Carnegie Mellon, Choset and his colleagues there begandeveloping their own snake robots. Cbosets team programmed robots to perform the samemovements as real snakes, such as sliding and inching forward. The robots also moved in waysthat snakes usually dont, such as rolling. Chosets snake robots could crawl (爬行) throughthe grass, swim in a pond and even climb a flagpole.

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