John Hunter had three advantages. He had a brother who was a doctor and he was thus able to learn about 11 and their effects. His 12 curiosity led him to observe and study the lives of wild animals in the countryside and he had strong and skillful hands, so 13 to a surgeon. In fact he became in a short time so famous that he was asked to lecture, but John 14 the practical work of the surgeon.
　　Soon after becoming a surgeon Hunter joined the army. He learnt a great deal from his 15 of dealing with soldiers' wounds. In particular, he studied how to 16 a wounded man from bleeding too much, learning thereby how the nerve system 17 in the bodies of animals and humans. But there were many things he did not know about and which could only be learnt by dissection. And this came to be a problem.
　　The Christian church whose authority was complete on many matters frowned on dissection. Surgeons had to pay grave-diggers to steal bodies for dissection. Hunter once paid $ 7, 000 for the body of an eight-foot Irishman whose skeleton can 18 be seen in the Royal College of Surgeons' museum. To be a surgeon was thought so 19 an occupation that many operations were carried out by barbers.
　　But Hunter continued with his  20 , all the time learning more about how our bodies worked, and he found new ways of operating on people so as to save both their limbs and their lives.

　　A.  already                B.  preferred            C.  experience          D.  inferior
　　E.  functioned           F. diseases              G. efficient             H. still
　　I.  essential                J. experiments        K. prevent              L.  natural
　　M.  prevailed             N.  explanation        O.  referred

　　答案：11. F 12. L 13. I 14. B 15. C 16. K 17. E 18. H 19. D 20. J