Q12: For the farmer who takes care to keep them cool, providing them with high-energy feed, and milking them regularly, Holstein cows are producing an average of 2,275 gallons of milk each per year. 第一步,排除A,C ,因为用的是Holstein cows are producing ,进行时态错;第二,排除B,D,前面用的keep them cool,them 为复数,用the Holstein cow 错。第三步,排除A,B, providing them with 从语法和逻辑上都错,也可从平等对等上排除。
Holstein cows will produce an average of 2,275 gallons of mild each per year for the farmer who takes care to keep them cool, (to keep them) provided with high-energy feed, and (to keep them) milked regularly.