When Li Bing built Yuzui Isle， he used Zhulong and Macha， a highly effective yet low-cost method， to prevent dirt and stones being washed away by fast running water.

When Li Bing built Yuzui Isle， he used Zhulong and Macha， a highly effective yet low-cost method， to prevent dirt and stones being washed away by fast running water.
A.正确
B.错误
正确答案：正确