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The Dujiangyan Irrigation System was launched and completed by Li Bing, a governor of Sichuan 2000 years ago。
The Dujiangyan Irrigation System was launched and completed by Li Bing, a governor of Sichuan 2000 years ago。
A.正确
B.错误
正确答案：A
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The main difference between contemporary dams and Dujiangyan system is that the former block the flow of water while Dujiangyan allows water to flow naturally。