It is the first time this has happened. The doctors are from the University of Maryland Medical Center. They say David Bennett, 57, is doing well after his operation(手术). The doctors said giving him the pig's heart was the only chance of keeping him alive. Bennett spoke to doctors the day before the operation. He said, "It was either die or do this transplant. I want to live. I know it's a shot in the dark, but it's my last choice." The pig's heart came from a genetically-modified(转基因的)pig.
The transplant operation took seven hours. Doctors received special permission(允许) from U.S. authorities(官方) for the experimental surgery(外科手术). Without it, Mr. Bennett would have died. They believe Mr. Bennett's transplant means more transplants could take place in the future. They said this could bring the world, "one step closer to solving the organ shortage crisis(器官短缺危机)". Surgeon(外科医生) Dr Bartley Griffith said, "We are also optimistic(乐观的) that this first-in-the-world surgery will provide an important new choice for patients in the future." Mr. Bennett hopes his transplant will allow him to live longer. "" He said.
A. Mr. Bennett was very ill.
B. Scientists have been researching pig-organ transplants for years.
C. I look forward to getting out of bed after I recover(恢复).
D. Doctors in the USA have transplanted(移植) a pig's heart into a man.
E. Scientists changed the genes(基因) of the pig so that its heart would be more suitable for a transplant into a human.
F. I am afraid of the failure of the experimental surgery.
