特异性感染的细菌是（）
A.大肠杆菌
B.破伤风杆菌
C.变形杆菌
D.绿脓杆菌
E.溶血性链球菌
参考答案：B
--- Jack fell off the ladder yesterday, but he is all right now.
---What a lucky dog! He _________ himself badly.
A．should injure
B．could have injured
C．should have injured
D．might injure
20世纪以后的教育特点有：教育的终身化、全民化、民主化、多元化和（ ）
A．个性化
B．教育技术的现代化
C．个别化
D．教育权利的平等化
-- Jack fell off the ladder yesterday, but he is all right now.