He questions what he calls the selectivity of government policy.他对他称之为政府政策的选择性提出质疑。Newer insecticides are tending toward a high degree of selectivity.新型杀虫剂都倾向于具有高度选择性。The soldiers specialized in going out in small groups, to kill with a very high degree of selectivity.这些士兵擅长小股出动，执行具有高度选择性的歼敌任务。