白喉的最常见并发症是（）
A.中毒性心肌炎
B.中毒性肾病
C.中毒性脑病
D.中毒性肝病
E.并发其他化脓感染
参考答案：A
The high school entrance examination will be over soon. Can you tell me _____the summer holiday?
A．where are you going to spend
B．how you are going to spend
C．where you were going to spend
D．how were you going to
简述机能制的优点和缺陷。
