A practice Heart

　　In Seattle, doctors have been able to use 3-D printing technology to“practice”risky operations so that they will face fewer surprises in the operating room. Kami Sutton was born with her heart“in the wrong place”. For a recent operation her doctor was able to take many scans of Sutton’ s heart and print out a model. “Kami’s heart is truly one-of-a-kind,”Dr. Stephan Seslar, a heart disease specialist said. “Operating on her without understanding the structure of her heart better could be very dangerous.”

　　A New Skull

　　A U.K. man was able to have part of his skull rebuilt thanks to a 3-D printer. Stephen Power broke his cheek bones in a crash. To help Power his doctors instead created 3-D bones all carefully printed in the shape of his face. “This is really the first time we’ve taken it to this stage, where everything has been planned and modeled in advance — and worked sweetly,” said Adrian Sugar, a doctor.

　　24．What is special about the 3-D printed airway?

　　A．It uses high-tech materials.

　　B．It varies in shapes and sizes.

　　C．It can be absorbed by the body.

　　D．It can prevent any disease in the airway.

　　25．What is the advantage of the new “bionic” hand?

　　A．Its price.

　　B．Its effects.

　　C．Its materials.

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