下列哪项是肺动脉瓣狭窄的并发症（）
A.缺氧发作
B.肺炎
C.脑脓肿
D.脑血管栓塞
E.细菌性心内膜炎
参考答案：E
He ___________all his pockets but failed to find his passport.
A．searched
B．searched for
C．in searched of
D．looked for
青春期龈炎（）。
