55. A. person　 　　　　　　　　 B. bird　　　　　　　　　　　 C. visitor　　　　　　　　　 D. friend

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In Twain, many people know what a “motorpool” means. It is 　21　 known as a place for the maintenance of official business and government cars.　 22　 it is a place for vehicle maintenance.

　　　 More than ten years ago I came to America on business and I took advantage of the 23 to visit my friend. My friend drove a car to　 24　 me at the airport, and took me to his home. Out of the 25 ,my friend drove his car into the innermost　 26　 , which had a sign“carpool only”. I 　27　 what“carpool”meant. I felt doubted whether he was going to a motorpool. 　28　 I thought myself clever in asking:

　　　 “Is there anything wrong with the car?”

　　　 “Nothing.　 29　 ?”said he.

　　　 “Well then, why are you going to carpool?”I　 30　 .

　　　 My friend couldn’t help　 31　 and told me that“carpool”refers to the lane that only the cars with two or more 　32　 can drive in. I felt rather embarrassed on　 33　 that.

　　　 After dinner, my friend’s neighbour came over to ask whether he　 34　 “carpool”the next day.“　 35　 ，”my friend said“Iwil accompany my friend to go shopping tomorrow.”I was 　36　 again, wondering why he could not“carpool”with him since we had“carpooled”　 37　 .My friend explained to me again that the“carpool”that his neighbour　 38　 meant they in turn drove the car to work so as to save energy. The first“carpool”is a noun, 　39　 the second“carpool”is a verb. It is really　 40　 for newcomers in America to understand it in a short time.

54. A. direct　　　　　　　　　　 B. private　　　　　　　　　 C. proper　　　　　　　　　 D. sudden

53. A. as　　　　　　　　　　　　　 B. unlike　　　　　　　　　 C. besides　　　　　　　　 D. with

52. A. medicines　　　　　　　 B. areas　　　　　　　　　　 C. measures　　　　　　　 D. effects

51. A. injured　　　　　　　　　 B. disabled 　　　　　　　 C. discovered　　　　　　 D. cured

50. A. diseases　　　　　　　　　 B. chickens　　　　　　　 C. hospitals　　　　　　　 D. fears

49. A. form　　　　　　　　　　　 B. sickness　 　　　　　　 C. pain　　　　　　　　　　 D. disaster　

48. A. because　　　　　　　　　 B. though　　　　　　　　　 C. if　　　　　　　　　　　　 D. while

47. A. killed　　　　　　　　　　 B. unknown 　　　　　　 C. rejected 　　　　　　　 D. infected

46. A. travellers　　　 　 B. people　　　　　　　　　 C. ducks　　　　　　　　　 D. animals