单选题 Some of the earliest mechanical devices were designed to raise water from streams for the irrigate of crops.
【正确答案】 D
【答案解析】 答案：D. irrigate: irrigation 分析：For 后面不应该直接用动词. The 进一步提示 参考译文：早期有些机械设备是设计从溪水中打水来灌溉作物的。