题目

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。Dujiangyan is the (old) man-made water system in the world, and a wonder in the development of Chinese science. Built over 2, 200 years ago in what is now Sichuan Province in Southwest China, this amazing engineering (achieve) is still used today.In ancient times, the region in which Dujiangyan now stands suffered regular floods (cause) by overflow from the Minjiang River. To help the victims of the flooding, Li Bing, the region governor, together with his son, decided to find effective solution. Li designed a series of channels 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, making suitable for farming.Once the system (finish), no more floods occurred and the people were able to live peacefully. Today, Dujiangyan is admired by scientists from around the world because of one feature. Unlike modern dams the water is blocked with a huge wall, Dujiangyan still lets water flow through the Minjiang River naturally, (enable) ecosystem (生态系统) and fish populations to exist in harmony. 答案：【1】oldest【2】achievement【3】from【4】caused【5】an【6】naturally【7】it【8】was finished【9】where【10】enabling

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