Detailed Instructions: Given a passage and a question, find the answer to the question based on the passage. The answer should consist of only one word that lies in the span of only one of the sentences in the passage.
Q: Paragraph: The Romans constructed numerous aqueducts throughout the Empire to bring water into cities and towns -- often from distant sources . The water supplied public baths , latrines , fountains , and private households . Aqueducts also provided water for mining operations , milling , farms , and gardens .
Question: what did the ancient romans build to maintain the supply of water in their cities

A:
aqueducts