题目内容：

    Losing an arm means losing the ability to grab, as well as losing the sense of touch. Scientists have been working on mind-controlled prostheses (义肢) and have successfully built a few to help patients regain their ability to grab. But restoring the sense of touch has been quite a challenge – until now.

Seven years ago, a group of Swedish scientists created a new type of prostheses, which has since then been tried out on three patients to see how they perform in people’s daily lives. The study result was recently published in the New England Journal of Medicine.

According to the study, this is the first time that people who have had an arm amputated (截肢) can experience sensations of touch in mind-controlled arm prostheses.

The new product is named “neuromusculoskeletal” prosthesis. As the name indicates, the prosthesis is connected directly to a user’s nerves, muscles and skeleton. The sensation of touch becomes possible by stimulating nerves that used to be connected to the biological hand before the amputation.

When a patient grabs an object, for example, force sensors planted in the prosthetic thumb would measure contact and pressure. The collected information would then be transmitted to the patient’s nerves that lead to the brain. In this way, the patient can “feel” the characteristics of the object being touched and perceive (感知) its pressure against the prosthetic hand, which can be crucial when handling delicate objects – an egg, for example.

“The ability of the patients to discern (觉察) smaller changes in the intensity of sensations has improved,” Max Ortiz Catalan, Associate Professor at Chalmers University of Technology, Sweden, who is the leader of the study, told Science Daily.

According to Catalan, the new study has demonstrated that their prosthesis is qualified as a “clinically viable replacement for a lost arm”.

“The sensors are not the obstacle for restoring sensation,” Catalan added. “The challenge is creating neural interfaces (接口) that can seamlessly (无缝地) transmit large amounts of artificially collected information to the nervous system, in a way that the user can experience sensations naturally and effortlessly.” And they did it.

With the development of prosthesis technology, people who suffer from limb loss will have a greater chance of getting their normal lives back.

1.Neuromusculoskeletal prosthesis’ unique advantage is helping people with arm amputations to _____ .

A.carry heavy objects again B.regain the ability to grab objects

C.move their prostheses as they wish D.experience the sense of touch again

2.The new prosthesis is connected directly to __________.

① user’s nerves  ② user’s brains  ③ user’s muscles  ④ user’s skeleton

A.① ② ③ B.① ③ ④ C.② ③ ④ D.① ② ④

3.How do the new prostheses work?

A.They collect information about objects and process it.

B.They stimulate the cut nerves to restore the sense of touch.

C.They measure the size of objects and send the information.

D.They detect the material of objects and send the information.

4.What can patients perceive with the new prosthesis?

A.The intensity of an object. B.The structure of an object.

C.The pressure from an object. D.The changes inside an object.

5.What is the difficulty in developing the new technology?

A.Measuring the pressure of objects. B.Connecting the sensors to nerves.

C.Creating good neural interfaces. D.Building responsive sensors.

6.What’s the author’s attitude towards the prospect of prosthesis technology?

A.Optimistic. B.Neutral.

C.Critical. D.Unconcerned.