45. A. clearer B. more C. possible D. rare
46. A. huge B. recent C. ordinary D. frightening 47. A. strange B. large C. deep D. rough 48. A. In the end B. Therefore C. After all D. However 49. A. imagined B. real C. special D. familiar 50. A. so B. besides C. again D. instead 51. A. rightly B. actually C. normally D. particularly 52. A. lightly B. jokingly C. seriously D. properly 53. A. succeed in B. insist on C. depend on D. join in 54. A. decision B. situation C. subject D. problem
55. A. zoo B. mountain C. museum D. laboratory 1． C 2 A 3． C 4． B 5． A 6． B 7． A 8． C 9． B 10． A 11． B 12．C 13．B 14．A 15．C 16．A 17．B 18．A 19．C 20．B 21．B 22．C 23．A 24，A 25．B 26.A 27．C 28．D 29，B 30．D 31．C 32．D 33．B 34．B 35，A 36．B 37．D 38．C 39．A 40．B 41．D 42．D 43．C 44A 45．B 46．C 47．B 48．D 49．B 50．C