非上市证券称作挂牌证券，是指未能通过证券主管机关的核准，在证券交易所外进行非法转让或交易的证券。 ( )
参考答案：错
根据句意改写句子，保持句意不变。
1. What's your name?
May ___________ ___________ your name?
2. Good-bye!
___________ ___________ tomorrow!
3. Thank you very much!
It's ___________ ___________ ___________ you.
4. Is there anything I can do for you?
Can ___________ ___________ ___________?
5. What's the matter?
What's ___________ ___________ you?
成人孤立性主动脉瓣狭窄的常见病因正确的是
A．风湿性炎症
B．先天性二尖瓣畸形
C．感染性心内膜炎
D．类风湿关节炎
E．强直性脊柱炎
