GRE Reading Comprehension: PPO-GRE阅读PPO - GX01HOGZ643THKP5R

The highlighted sentence serves primarily to A. provide information about the kinds of forage preferred by prairie dogs B. refute a particular claim about the forage methods of prairie dogs C. specify what makes forage conditions created by prairie dogs appealing to bison D. suggest that prairie dogs' activities can cause environmental degradation E. identify characteristics that influence prairie dogs'selection of sites to colonize