GRE Reading Comprehension: JiJing 352-GRE阅读机经352篇 - 57WXJFTS35TX741UJ

The passage suggests which of the following about cenotes? A. They allowed people in northern Yucatan to avoid dependence on artificial reservoirs. B. They were less capacious than the artificial reservoirs found in the Maya Lowlands. C. They helped protect people in the Maya Lowlands from prolonged droughts. D. They allowed the Maya to store excess water for times of need. E. They were an important Mayan social innovation.