Tom was born __ December the first.[ ]
A. in
B. on
C. at
D. during
答案：B
简述吸附速率
新生儿应接种
A．麻疹疫苗B．乙型脑炎疫苗C．脊髓灰质炎疫苗D．百、白、破混合制剂E．乙肝疫苗
