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transplant showed that a heart from a genetically edited animal can function in the human body without immediaterejection.The patient,David Bennett,57,knew there was no guarantee that the experiment would work but he wasdying,unsuitable for a human heart transplant and had no other option,his son told The Associated Press.Such transplants,or xenotransplantation,have failed before,largely because patients'bodies rapidly rejectedthe animal organ.The difference this time:The Maryland surgeons used a heart from a pig that had undergonegene-editing to remove a sugar in its cells that's responsible for that super-fast organ rejection."I think you can characterize it as a breakthrough in medical science,"Dr.David Klassen,UNOS'chiefmedical officer,.said of the Maryland transplant.Still,Klassen warned that it's only a first tentative（实验性的)step into exploring whether this time around,xenotransplantation might finally work.It will be important to share the data gathered from this transplant before opening the option to more patients,said Karen Maschke,a research scholar at the Hastings Center,who is helping develop policy recommendations forthe first clinical trials under financial aid from the National Institutes of Health."Rushing into animal-to-humantransplants without this information would not be advisable,"Maschke said.The surgery took seven hours last Friday at the Baltimore hospital."He realizes the importance of what wasdone,"David Bennett Jr.said of his father."He could not live,or he could last a day,or he could last a couple ofdays.I mean,we're in the unknown at this point."8.What is the top reason for the animal-to-human transplant on David Bennett?A.He couldn't afford a human heart.B.His son made the decision for himC.His life was at great riskD.The experiment is bound to save his life.9.What is the purpose of the gene-editing in the case of the transplant in Maryland?A.To avoid immediate rejection.B.To remove cells from the pig's heart.C.To guarantee the functions of the pig's heartD.To save time in the transplant.10.What does Dr.David Klassen probably think of the transplant?A.CasualB.Dangerous.C.Successful.D.Pioneering.11.What message does the author mainly convey in the text?