脑栓塞栓子最常见的来源是( )
A．冠心病伴房颤B．冠心病心肌梗死C．脑动脉硬化D．感染性心内膜炎E．风心病伴房颤
参考答案：E
He felt nervous when facing the judges, and _______.[ ]
A. so were the other competitors
B. so did the other competitors
C. the other competitors did either
D. neither were the other competitors
( )是人寿保险合同在宽限期内的效力状况。
A．效力不变 B．已经无效 C．暂时无效 D．效力减弱
