17. The primary purpose of the passage is to treat the accepted generalizations about organ transplantation in which of the following ways?
Explicate their main features
Suggest an alternative to them
Examine their virtues and limitations
Criticize the major evidence used to support them
Present findings that qualify them
18. It can be inferred from the passage that the author believes that an important difference among strains of rats is the
size of their livers
constitution of their skin
strength of their immune-response reactions
sensitivity of their antigens
adaptability of their lymphocytes
19. According to the hypothesis of the author, after a successful liver transplant, the reason that rats do not reject further transplants of other organs from the same donor is that the
transplantation antigens of the donor and the recipient become matched
lymphocytes of the recipient are weakened by the activity of the transplanted liver
subsequently transplanted organ is able to repair the damage caused by the recipients immune-response reaction
transplanted liver continues to be the primary locus for the recipients immune-response reaction
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