关于麻疹的并发症下列哪项是错误的（）
A.喉、气管、支气管炎
B.营养不良与维生素A缺乏症
C.肺炎
D.亚急性硬化性全脑炎
E.急性肾炎
参考答案：E
. All of the guests ___________ by 9 o’clock , but the host _____________ until 15 minutes later .
A．arrived; didn’t turn up
B．had arrived; didn’t turn up
C．arrived; hadn’t turned up
D．had arrived; hadn’t turned up
钩锁链的松余量为（）mm。
A、30~40
B、30~45
C、30~50
