保护易感人群最重要的措施是（）。
A．人工自动免疫
B．人工被动免疫
C．药物预防
D．个体防护
E．自然自动免疫
参考答案：A
The little boy often makes his mother _____him _____.
A．talk ,something interesting
B．tell, something interesting
C．say, interesting something
D．speak , interesting something
“总账当前余额查询”交易是查询本机构或下辖机构科目的（）。
A.当前余额
B.上日余额
C.上月底余额
D.上年余额
