A. slows down all the time

　　B. speeds up all the time

　　C. speeds up part of the time and slows down part of the time

　　D. moves at a constant speed

　　66．As the diagram shows, there is a fixed superconductor ring, on the right of which lies a bar magnet. There is no electric current. When the magnet is moved to the right, because of electro-magnetic, induction, a certain electric current is produced. Thus the direction of the electric current is________ .

　　A. as indicated by the arrowhead in the diagram. When the magnet is moved away, the electric current will soon disappear.

　　B. as indicated by the arrowhead in the diagram. When the magnet is moved away, the electric current will still remain.

　　C. in the opposite direction. When the magnet is moved away, the electric current will soon disappear.

D. in the opposite direction. When the magnet is moved away, the electric current will still remain.

D

　　From the very beginning, Martin felt that he was bound up with（与……紧紧地在一起）his lovely little patient. One day, following some tests , Betty gave the doctor a big hug（拥抱）.

　　A few months later the doctor removed not only the tumour（肿瘤）, but also the entire lower left side of Betty’s gum（牙龈）and jawbone. Because Betty was so young, Martin was hopeful that her jawbone might regenerate.

　　Within three months, Betty’s tumour grew as large as an orange, changing the natural appearance of the left side of her small, delicate （ = thin; not strong）face. Soon she couldn’t even close her mouth, and as her eating problems worsened, Betty ‘s weight dropped from 20 kilos to 15. Martin knew from experience that it might invade the brain.

　　The only other possibility was thorough radiation therapy （放射疗法）. Night after night, Betty's father gave her injection, but the tumour remained as big as ever. Then one evening. Morgan noticed that the tumour had begun to change. It was actually becoming smaller! For two months her tumour appeared to be going away for ever. In the coming months, Betty’s tumour continued to appear. She was able to eat solid food once again. Her jawbone was regenerating. The tumour was gone.

　　67．What do you think the underlined word regenerate means? It means “________”.

　　A. lose one’s life

　　B. give a new life to

　　C. be made by hand

　　D. pass on from one generation to another