GRE Reading Comprehension: ETS Official Practice 150-GRE OP150: 阅读 - HE3SNDA8MX4988KJ1

Despite hypotheses ranging from armed conflict to climate change, the abandonment of more than 600 Pueblo cliff dwellings in Mesa Verde by A.D. 1300 still puzzles archaeologists. Researchers analyzing refuse from one Pueblo community found remains of maize – a Pueblo crop – in 44 percent of samples from years when the community flourished, but in only 10 percent of samples from years near the time of depopulation, while the remains of wild plants increased significantly. Bones found in the samples showed that the consumption of domesticated turkeys – which were fed maize – decreased from 55 to 14 percent, while there was a marked increase in wild-animal bones. These data suggest that near the end of the site's occupation, villagers experienced substantial food shortages and adopted hunting-and-gathering strategies to compensate for crop failure.