15．Jayson McCarthy，12，was born without fingers on his left hand．That didn't stop him from being able to do many tasks．But Jayson could not grasp more than one object at a time．So Jayson's father，Paul，created a Prosthesis（假肢），using a 3D printer．Now Jayson has fingers that open and close．"It was a do-it-yourself，father-and-son adventure，"says Paul．
When Jayson 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 Jayson should first learn to get full use out of the hand he was born with，"says Paul．As Jayson got older，his father looked into purchasing 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-which costs around 2，000-and some materials．
Luckily，Jayson's school had recently purchased a 3D printer and it offered to help Paul build the hand for Jayson n．"We used a soccer shinguard（护胫），cardboard（硬纸板），and tape．They cost about 10，"says paul．
With his new hand，Jayson can do things better．"I can help my mom more，because now I can carry two grocery bags，"he says．
Jayson's father has already built several hands for Jayson．Jayson helps design each one．He says there's one thing in particular that he wants to do with a future prosthesis．"The goal，"he says，"is to be able to tie my shoelaces（鞋带）．"
21．Why did Jayson's doctor disapprove of（不赞成） his using a prosthesis in his childhood？C
A．The prosthetic technology was underdeveloped then．
B．A prosthesis was very expensive at that time．
C．To use the disabled hand was important．
D．The original hand could do many tasks．
22．Jayson's father managed to get Jayson a new hand byD．
A．collecting money on the Internet
B．buying a prosthetic hand
C．buying a 3D printer
D．printing a hand
23．The underlined word in paragraph 2can be replaced byA．
A．buying
B．borrowing
C．renting
D．making
24．What's the best title for the text？B
A．A DIY Enthusiast
B．A Helping Hand
C．A Great Adventure
D．A Lucky Escape．
分析 本文主要写了Jayson天生左手没有手指头，为了帮助孩子他爸爸用3D打印机为孩子建了假肢．
解答 21．C 细节理解题．根据医生的话The doctor said Jayson should first learn to get full use out of the hand he was born with．Jayson应该先学会充分利用他天生的手，所以答案选C．
22．D 细节理解题．根据句子Jayson's school had recently purchased a 3D printer and it offered to help Paul build the hand for Jayson，Jayson的学校拥有3D打印机，它帮助Jayson的爸爸Paul为Jayson建了一个假手，所以答案选D．
23．A 词义猜测题．根据后一句which can cost as much as 30，000，这样能花费多达30，000，提到花钱所以可以猜测他爸爸想给他买个假肢，purchase应该是买的意思，所以答案选A．
24．B 主旨大意题．本文主要写了Jayson天生左手没有手指头，为了帮助孩子他爸爸用3D打印机为孩子建了假肢．所以答案选B．
点评 在阅读时要抓住文章的主题和细节，分析文章结构，根据上下文内在联系，挖掘文章的深层含义，对于暗含在文章中的人物的行为动机，事件中的因果关系及作者未言明的倾向、意图、态度、观点等要进行合乎逻辑的判断、推理、分析，进一步增强理解能力，抓住材料实质性的东西．
