题型：语法填空（语篇） 题类：常考题 难易度：困难
山东省济宁市2019届高三上学期英语期末考试试卷（含小段音频）
On Aug 13，four Chinese irrigation sites won global (recognize)and were added to the 2018 list of Heritage Irrigation Structures， among Dujiangyan is the oldest and only surviving damless irrigation system in the world.
Built over 2，000 years ago in is now Sichuan Province in Southwest China， this amazing engineering achievement is still playing a crucial role in irrigating farms and providing water resources for more than 50 cities in the province.
In ancient times，the region in which Dujiangyan now stands (threaten)by frequent flooding from the Minjiang River. Li Bing，a local official of Sichuan Province at that time，together with his son，decided to construct an irrigation system on the Minjiang River (prevent)flooding. After many studies，they found the (simple)solution was to build a dam，but this would have ruined the Minjiang River. So instead Li designed a series of (channel)built at different levels along Mount Yulei that would take away the floodwater while leaving the river flowing (natural).Better still， the extra water could be directed to the dry Chengdu Plain， (make)it suitable for farming.
Ever since the great Dujiangyan Irrigation System was completed， the Chengdu Plain has been free flooding and the people there have been living peacefully.
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