different plants in Holland, but now there are only 860. ____44___ have been destroyed by modern man and his technology. We can't live without these things. ____45___ the end, we'll destroy ourselves.

____46___will happen in the future? Many people are hoping to save our world. They plant trees, build bridges ___47___ rivers, protect animals and so on. In a small town in the United States, a large group of girls ___48___ the banks of eleven kilometers of their river. Young people may hear of conversation through a record ___49___ "NO ONE'S GOING TO CHANGE OUR WORLD". It was made by Cliff Richard and other singers. The money from it ___50___ to conserve wild animals.

41. A. knew B. to know C. know D. knowing

42. A. quick B. more quickly C. quicker D. more quick

43. A. are B. is C. were D. was

44. A. Other B. Others C. The other D. The others

45. A. At B. By C. To D. In

46. A. How B. Why C. What D. Which

47. A. through B. across C. pass D. past

48. A. clean B. cleaned C. cleaning D. will clean

49. A. called B. calling C. calls D. call

50. A. help B. helping C. will help D. to help

五、 完形填空 （共10小题；每小题1分，满分10分）

Several days ago, some students from the US visited our school. When we talked, I discovered 51 differences in school life between the US and China. For example, each class 52 fifty minutes in the US. It is a little 53 than that in China. We usually have forty minutes in each class. Another difference is that they have less break time between 54 . Besides, although most schools in both countries finish their ___55_ classes at 12 o'clock, the students in the US only have one-hour long break, so they 56_ have lunch quickly. Their afternoon classes begin at 1:00 pm and school is over 57 3:00 pm. Then they take part in club activities or play sports.

Many Chinese students don't work during their high school years, while the US students like