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BSpinal(脊椎的)implants allow the paralyzed(瘫痪)to walk,swim and cycle againFour years ago Michel Roccati was involved in a motorcycle accident.He lost all sensationbelow the site of the damage to his spine and he could no longer move his legs.In December lastyear,however,the young Italian stood up on the streets of Lausanne,Switzerland,and took a shortwalkMr Roccati's remarkable steps,supported by a wheeled walking frame,were the conclusion ofmore than a decade of work by Gregoire Courtine,.a neuroscientist(神经学家)at the FederalInstitute of Technology in Lausanne,and Jocelyne Bloch,a neurosurgeon at Lausanne UniversityHospital.The scientists had fitted Mr Roccati with a thin device that stimulated nerves in his back thatonce controlled muscles in his lower body and legs,which lay senseless after his accident.Even aftera severe spinal injury,the nerves controlling activities often remain undamaged below any damagedtissue.In paralyzed people,however,the damaged tissue interrupts or weakens any electrical signalsfrom the brain.Dr Courtine and Dr Bloch developed a thin device with electrodes (thattargeted the senseless nerves.Once implanted into Mr Roccati's back,the device acted like anamplifier (for any electrical signals from his brain and sent in electrical impulses like thosenormally present in the nerves of an uninjured person.Thus,Mr Roccati was able to voluntarilycontrol those once-senseless nerves and move his legs and walk.Mr Roccati was one of the three paralyzed volunteers who took part in a small clinical trial ofthe device.Two other trials were able to stand up and take a few steps almost immediately after theyhad recovered from the surgery to have it implanted.The device can also be fitted to fire itselectrical impulses in many different patterns corresponding to different activities.Patients in thetrial were not only able to stand and walk,but to swim and cycle.The device will need approval from medical regulators before it can be used andcommercialized in clinics.24.What did Michel Roccati suffer?A.He lost all sensation.B.He lost his legs.C.His spine was injured.D.His nerves got damaged.25.What is the function of the device?A.To kill the pain of the backB.To cure the damaged tissue.C.To control muscles and activitiesD.To strengthen brain electrical signals26.What does the writer think of the device?A.Effective.B.Impractical.C.Perfect.27.What can be inferred from the text?D.InconvenientA.The device is well receivedB.The device needs improvement.C.It takes time to market the device.D.The device benefited lots of patients.高三英语第4页（共10页）
