麻疹减毒活疫苗接种时间是
A.4个月
B.6个月
C.8个月
D.10个月
E.12个月
参考答案:C
解析:[考点评析] 护理、营养、教养、体格锻炼、传染病管理和计划免疫。
下列过程所发生的化学变化属于取代反应的是( )
A.在FeBr3催化作用下苯与液溴反应
B.在镍做催化剂的条件下苯与氢气反应
C.乙烯在空气中燃烧
D.乙醇在铜做催化剂的条件下生成乙醛
I had wanted to clean out the basement ______, but unfortunately he came back before I did it. [ ]
A. in a hurry
B. in his absence
C. in his memory
D. in his company