Leon, 12, was born without fingers on his left hand.That didn't -stop him from being able to do
many tasks. But Leon could not grasp more than one object at a time. So Leon's father, Paul, created
a prosthesis(假肢），using a 3D printer. Now Leon has fingers that open and close."It was a
do-it-yourself, father and son adventure," says raw.
When Leon was a baby, his doctor advised his parents not to give him a prosthetic hand until he
was in his early teens. "The doctor said Leon should first learn to get full use out of the hand he was
born with," says Paul. As Leon got older, his father looked into buying a prosthetic hand, which can
cost as much as $30,000. Paul found a more affordable solution.
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:'
24. 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.
25. Leon's father managed to get Leon a new hand by
A.collecting money on the Internet. B. buying a prosthetic hand
C. purchasing a 3D printer D. printing a hand
26. The materials used for Leon's hand can be described as
A. cheap and common B. strange and valuable
C. personal and lovely D. basic and solid
27. Where can the passage be taken from?
A. An advertisement B. A newspaper C. A poster D. A travel guide