1 . 阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。
Originally constructed around 256 BCE by the State of Qin 1 an irrigation and flood control system, Dujiangyan is a remarkable example of ancient engineering skill and is still 2 use today.
During the Warring States period, people who lived along the banks of the Min River 3 (trouble) by annual flooding. Qin governor and irrigation engineer Li Bing investigated the problem thoroughly. He led a team 4 (construct) a levee(堤坝) to redirect a part of the river’s flow. Then they cut 5 channel through Mount Yulei to let the water flow through it. After the system was finished , no more floods 6 (occur). What’s more, it made Sichuan one of the most productive agricultural 7 (region) in China because the redirected water from the Min River could be used for irrigation. If you visit Dujiangyan, you will see an 8 (usual) construction that looks like a fish’s mouth. This famous attraction, Yuzui, together with two other important parts, namely, Feishayan and Baopingkou, was 9 (scientific) designed to control the water flow throughout the year.
10 (recognize) as a UNESCO heritage site, Dujiangyan has irrigated farms while preventing floods for over 2,000 years.