“Half the land on earth is too rough,sandy,or rocky for wheeled things,”says Raibert.“Humans and animals can go to those places.They are the only examples of successful systems that do what we’re trying to do.”

　　None of the walking robots is meant to fight.They’re designed to put out fires and clean up industrial accidents.But they are all funded by the military.“I’m well aware of how the world works,”says Dennis Hong,founding director of Virginia Tech’s robotics lab.“Robots for me are tools to help society,not to fight in wars.But once a technology leaves our lab,there’s no way to control how people can use it.”

　　1.In Marc Railbert’s opinion,robots need to be designed like humans to 　. 

　　A.accomplish complex tasks

　　B.be controlled efficiently

　　C.survive disasters

　　D.appear friendly

　　2.Which of the following is most likely to be Cheetah?

　　3.The underlined word “They”in Paragraph 3 most probably refers to 　. 

　　A.Cheetah and the Legged Squad Support System

　　B.humans and animals

　　C.wheeled things

　　D.legged robots

　　4.How does Dennis Hong feel about using robots in wars?

　　A.Surprised.B.Cautious.

　　C.Uninterested. D.Helpless.

　　B

　　When it comes to preschool education,there are two lines of thought.One says that preschoolers need to be taught early academic skills in order to get a leg up on future school achievement.Another says the focus should be on social and emotional development.But,new research from Penn State University says a high quality preschool program should do both.

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