Over2,200yearsago,Chengduwasthreatenedbyfrequentfloods....

问题详情：

Over 2,200 years ago, Chengdu was threatened by frequent floods. Li Bing, together with his son, decided to construct an irrigation system on the Minjiang River____41____ (prevent) flooding.  ___42___having a long study and a lot of hard work by the local people, the great Dujiangyan Irrigation System was completed. Since then, the Chengdu Plain ___43___ (be) free of flooding and the people have been living peacefully and wealthily.

It is the___44___ (old) and only surviving no-dam irrigation system in the world. It is also ___45___ wonder in the development of Chinese science. The project consists of three important parts，namely Yuzui, Feishayan and Baopingkou, which were ___46___(science) designed to control the water flow of the rivers throughout the year.

There is a glorious bridge called the Anlan Cable Bridge crossing the Minjiang River above Yuzui, ___47___ you can clearly see the entire system. The great ___48___ (construct) originally started before the Song Dynasty. At that time, the body of the bridge was constructed with wooden blocks and the handrails(扶手)were made of bamboo. Recently the wood and bamboo have been replaced with steel and concrete to guarantee the security of ___49___(visit) from home and abroad. Seen from afar, the bridge looks like a rainbow ___50___(hang) over the river.

【回答】

41. to prevent    ...

42. After    43. has been   

44. oldest       45. a   

46. scientifically   

47. where    48. construction   

49. visitors   

50. hanging 

知识点：语法填空

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