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考点规范练32(选修7 Unit 2) .阅读理解 A Robots have proven very useful in different situations.But those robots are small remote-controlled tanks with a mechanical arm,and they can get hung up on narrow stairwells(楼梯井) and are stopped by ladders.“A lot of the places where you do disaster recovery are only accessible for people,”says Marc Raibert,the president of Boston Dynamics,which is providing advice and help for Defense Advanced Research Projects Agency(DARPA)—the scientific research department of the U.S. military(军队)—to create the most advanced robots on earth.“If you’re a humanoid—a machine or creature with the appearance and qualities of a human—access can be increased and you can use available tools.”In the future DARPA hopes,a humanoid robot will be able to drive trucks,and enter power plants. That future is a long way off.Simple movements like squatting(蹲) are almost impossible for something with metal parts and skin that cannot bend,says Raibert.Still,recent progress is impressive enough that the military has begun to bet on legged bots.The Office of Naval Research is working with Virginia Tech on a humanoid firefighting robot,and Dynamics showed off two of its latest projects:Cheetah,a four-legged robot capable of running 28 miles per hour,and the Legged Squad Support System,a big and awkward headless robot funded by DARPA and the Marine Corps to help carry things in places like mountain areas. | 
