College of Engineering, and they accepted the challenge. Brendan O'Toole, chairman of the mechanical engineering department, said he and his team had got a lot of requests, "but this one was different." They got to work using a 3D­printer. Several prototypes(原型) and fittings later, Hailey got her first hand about four years ago.

　　Hailey's mother said the hand had given her daughter a wonderful lift. "When she puts this robotic hand on, it changes her personality and confidence level，" Yong Dawson told CBS San Francisco. "I love seeing that. I just wanted her to have an even playing field."

　　When she arrived at AT&T Park on Sunday, Hailey got to hang out with players in the shelter at the side of the sports field. They even let her try on their World Series rings.

　　Using her 3D­printed hand, Hailey threw out the perfect first pitch. Then with a wave and a smile, she headed into the stands to cheer on her newfound friends on the Giants.

　　【解题导语】　本文主要介绍了内华达大学工程学院的工作人员用3D打印技术帮助一个患有Poland综合征的小女孩打印假肢的事情。

　　5．What caused the function loss of Hailey's hand?

　　A．A serious brain disorder.

　　B．A born physical problem.

　　C．An awful game accident.

　　D．An unexpected infection.

　　B　解析：细节理解题。根据第二段第二句"Hailey was born with Poland syndrome, a disorder in which affected individuals were born with missing or underdeveloped muscles on one side of the body."可知，Hailey手功能丧失是天生的生理上的问题，故选B。

　　6．Why did Yong Dawson ask the University of Nevada for help?

　　A．She couldn't find a suitable hospital.

　　B．She knew it had the advanced 3D­printer.

　　C．She couldn't afford a traditional prosthetic hand.

　　D．She was forced to accept the tough challenge.

　　C　解析：细节理解题。根据第三段第一句"With a traditional prosthetic(义肢的) hand potentially costing thousands of dollars, Hailey's mom, Yong Dawson turned to the University of Nevada, Las Vegas for help."可知，Yong Dawson向内华达大学求助的原因是传统的假肢费用昂贵，她支付不起，故选C。

　　7．What is Hailey's mother's attitude towards the 3D­printed hand?

A．Skeptical. B．Positive.