题目

下列措施中，不属于预防接种的是                                                          （   ） A．婴幼儿注射百白破疫苗                  B．幼儿口服脊髓灰质炎疫苗 C．为肝炎病人注射胎盘球蛋白              D．为青少年注射乙肝疫苗 答案：C The goods bought on line are ________ than those bought in stores． [　　] A． more cheaper B． more cheap C． far cheaper D． far cheap