The future R2 would be designed to operate by itself．But for difficult tasks, a human operator would control it like an avatar in a video game．NASA will need people skilled at operating robonauts to ensure the success of future missions．So the next time your mom complains that you’re spending too much time on video games, just tell her you’re training for a job with NASA．

　　51．In paragraph1, the writer gives a detailed description of a space accident to

　　A．stress the danger of an astronaut’s walk in space

　　B．tell readers the unforgettable experience of an astronaut

　　C．show his concern for the present situation of space walk

　　D．introduce what robots are likely to do for astronauts

　　52．Why does the writer say Robonaut 2 is “The Real Deal”?

　　A．It may have the advantage for complex and small tasks at low costs．

　　B．It has been programmed to help astronauts with three D’s．

　　C．It is flexible and can be easily controlled by humans beings．

　　D．It proves to be a good companion for space travelers．

　　53．By saying“All in all, a pretty sweet life for a humble robot!”, the writer means that

　　A．an ordinary robot will be able to move freely in comfortable surroundings

　　B．an ordinary robot will enjoy a comfortable life in space like humans on Earth

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