【名词&注释】
现代畜牧业(modern animal husbandry)、良种化(improved variety system)、辽宁绒山羊(liaoning cashmere goat)、示范区建设(demonstration area construction)、性能好(good performance)
[单选题]《现代畜牧业示范区建设评估办法(试行)》规定,奶牛示范区良种化率应达到()
A. 50% B. 80% C. 90% D. 100%