麻疹减毒活疫苗的初种月龄为
A.2~3个月
B.4~5个月
C.6~7个月
D.8~12个月
E.13~14个月
参考答案:D
What do you know about the man [A] He was not born in Beijing. [B] His parents like Beijing better than he does. [C] Beijing is the place where his parents were born.
电泳