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阅读下面材料,在空白处填入1个适当单词或括号内单词的正确形式。

On Aug 13, four Chinese irrigation sites won global 1.(recognize) and were added to the 2018 list of Heritage Irrigation Structures, among 2. Dujiangyan is the oldest and only surviving damless irrigation system in the world.

Built over 2,000 years ago in 3. 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 4.(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 5.(prevent) flooding. After many studies, they found the 6. (simple) solution was to build a dam, but this would have ruined the Minjiang River. So instead Li designed a series of 7.(channel) built at different levels along Mount Yulei that would take away the floodwater while leaving the river flowing 8.(natural). Better still, the extra water could be directed to the dry Chengdu Plain, 9.(make) it suitable for farming.

Ever since the great Dujiangyan Irrigation System was completed, the Chengdu Plain has been free 10. flooding and the people there have been living peacefully.

高三英语语法填空困难题

少年,再来一题如何?
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