Choset has also built larger snake robots designed for search and rescue，or just exploration.They can climb poles or trees and then look around through a camera in the head，and slid through places humans can’t reach.

　　Another expert at Carnegie Mellon stresses that there’s still an enormous gap between humans and even the most high­tech robots.Manuela Velosa noted that robots have been built that are good at one or two tasks—but not at the variety of tasks humans perform without even thinking.

　　Velosa has been building robots that ask humans for help when they don’t know what to do，as well as teams of robots that play soccer against each other.Sometimes，the robots surprise her by having once defeated the other team.

　　“It was programmed by me，but it looked to me as if they learned，” she said.“I believe we are much closer to having robots be able to exist with humans peacefully.The beautiful thing is you see the robots learning.”

　　1．How does Choset help save medical costs?

　　A．By changing the size of robots frequently.

　　B．By designing larger snake robots.

　　C．By making complex surgeries faster and easier.

　　D．By improving the models of earlier snake robots.

　　．The main advantage of using the thin surgical robot is________.

　　A．reducing the damage to the body

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