视听说(III)Unit-5-Item-2.ppt

* Doctors perform transplants to (1) __________ organs or tissue in a person who is sick or (2) __________. There are records of a transplant operation that (3) __________ in 1823. A German doctor, Carl Bunger, (4) __________ skin from a woman’s leg and used it to rebuild her nose. Scientists later showed that the defense system in the body tries to (5) __________ tissue transplanted from other people. Rejection (6) ______________ a problem from transplants well into the 20th century. In 1958, the French doctor Jean Dausset discovered a system to match tissue. This is a way to (7) __________ that the tissues to be transplanted is closely (8) __________ the patient’s own. In 1972, the Swiss scientists Jean Borel discovered that the drug cyclosporine could stop the rejection. Cyclosporine is (9) __________ a fungus that lives in soil. Experts say this drug is the most important (10) __________ for the success of transplant operations today. Doctors perform transplants to (1) __________ organs or tissue in a person who is sick or (2) __________. There are records of a transplant operation that (3) __________ in 1823. A German doctor, Carl Bunger, (4) __________ skin from a woman’s leg and used it to rebuild her nose. Scientists later showed that the defense system in the body tries to (5) __________ tissue transplanted from other people. replace injured took place removed reject *