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is harmful to health. a. are believed b. had believed c. has believed d. believe 38. The majority of the damage ______ easy to repair. a. is b. are c. were d. be 39. Fourfifths of the crop ______. a. are ruined b. was ruined c. were ruined d. have been ruined 40. Threefourths of the buildings ______. a. was destroyed b. is destroyed c. were destroyed d. has been destroyed 41. Early to bed and early to rise ______ a man healthy, happy and wise. a. making b. to make c. make d. makes 42. Mathematics ______ the language of science. a. is b. has been c. are d. have been 43. The young ______ the vital forces in our society. a. is b. has been c. are d. have been 44. Every man, woman and child ______ some history, enough at least, to survive in the world. a. knows b. know c. is known d. are known 45. None of them ______ my friends. a. is b. are c. was d. has been 46. Not only the whole nation, but the whole Europe , indeed the whole human society ______ to alter its attitude to racial problems. a. need b. needs c. has a need d. have a need 47. Getting to other plas or to the moon _____ many problems. a. involve b. involves c. involving d. to involve 48. In that country, the rich ______ richer, the poor, poorer. a. bee b. has bee c. bees d. is being 49. The project requires more labor than ______ because it is extremely difficult. a. has been put in b. have been put in c. being put in d. to be put in 50. Not one in one hundred children exposed to the disease ______ likely to develop it. a. should be b. must be c. is d. are 【試題答案】 19 d 37 d 20 c 38 a 21 d 39 b 22 b 40 c 23 a 41 d 24 a 42 d 25 c 43 c 26 a 44 a 27 d 45 b 28 a 46 b 29 d 47 b 30 d 48 a 31 c 49 a 32 c 50 c 33 c 51 34 d 52 35 c 53 36 a 54