The following text is from a history article about ancient Rome.
Roman aqueducts were engineering marvels that transported water across vast distances. Engineers carefully calculated the gradual slope needed for water to flow naturally by gravity. These structures supplied cities with fresh water for drinking, bathing, and public fountains.
What is the main purpose of the text?
To argue that Roman engineering was superior to modern methods
To explain the limitations of ancient water systems
To describe how Roman aqueducts functioned and their uses
To compare Roman aqueducts with those of other civilizations
Correct Answer: C
Choice C is the best answer. The text describes how aqueducts worked (using gravity and calculated slopes) and lists their uses (drinking, bathing, fountains).
- Evidence: The text explains they "transported water" using "gradual slope" and "gravity" (function) and "supplied cities... for drinking, bathing" (uses).
- Reasoning: The focus is entirely on the operation and utility of the aqueducts.
- Conclusion: Thus, the purpose is to describe their function and uses.
💡 Strategy: Look for the main subject (aqueducts) and what the author says about it (how they worked, what they were for).
Choice A is incorrect because no comparison to modern methods is made. Choice B is incorrect because limitations are not discussed. Choice D is incorrect because no other civilizations are mentioned.