We are kept ______ of what is happening in the world by reading newspapers and watching television .

A．reminded

B．informed

C．remembered

D．told

小儿时期免疫系统特点有（）

A.补体、趋化因子、调理素等活性因子及白细胞吞噬能力等也较低

B.婴幼儿期SIgA较缺乏，易患呼吸道及胃肠道感染

C.新生儿可从母体获得抗体IgG，一般6个月后消失

D.新生儿时IgM量较高，不易患革兰阴性细菌感染

E.主动免疫IgG一般约3～5岁时才达到成人水平