GRE Reading Comprehension: OG/PP2-GRE阅读OG/PP2 - F1ITP117P16U36S4P

According to the passage, before the recommendations by the government entomologists, which of the following was true about farming west of the Mississippi River? A. Farmers focused primarily on growing wheat. B. Peas and beans had not yet been planted in the region. C. A relatively small portion of farmland was devoted to crops other than wheat.