One day, Paul discovered a video on the Internet about Robohand, a prosthesis created with a 3D printer. He downloaded the free instructions and called Robohand's creators for advice. They told him all he needed was a 3D printer一which costs around $2,000- and some materials.

　　Luckily, Leon's school had recently purchased a 3D printer and it offered to help Paul build the hand for Leon.“We used a soccer shin guard（护胫），cardboard, and tape. They cost about＄10," says Paul.

　　With his new hand, Leon can do things better. "I can help my mom more, because now I can carry two grocery bags,”he says.

　　Leon's father has already built .several hands for Leon. Leon helps design each one. He says there's one thing in particular that he wants to do with a future prosthesis.“The goal," he tells the reporter from the local evening paper,“is to be able to tie my shoelaces:'

　　1. Why did Leon's doctor disapprove of his using a prosthesis in his childhood?

　　A.The prosthetic technology was underdeveloped then.

　　B. A prosthesis was very expensive at that time.

　　C. To master the disabled hand was important.

　　D. The original hand could do many tasks.

　　2. Leon's father managed to get Leon a new hand by

　　A.collecting money on the Internet.

　　B. buying a prosthetic hand

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