单选题 2.  Group insurance, which is the most common form of medical insurance in the United States, ______ the healthy, for generally adequate health is a precondition for employment.
【正确答案】 C
【答案解析】 选项A错误，pick over意思是“筛选”，与“公司雇员均应是身体健康的”矛盾。选项B错误，pick on意思是“批评”，句意不通。选项C正确，文中的pick out意思是“挑选出”，选项D错误，pick at意思是“(用手指)抓弄”，句意不通。